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3 | <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> |
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4 | <head> |
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5 | <title>imdisp.pro (SAXO Documentation Assistant)</title> |
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6 | </head> |
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11 | <!-- Navbar template takes a structure with the following fields: |
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43 | |
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44 | |
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45 | <table border="0" cellpadding="0" cellspacing="0" width="98%" bgcolor="#F0F0FF" valign="bottom"> |
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46 | <tr> |
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47 | <td width="10%"> |
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48 | <a href="image_viewer.html"><img src="./../prev.gif" border="0" alt="Previous"></a></td> |
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49 | <td width="80%" align="center" valign="center"> |
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50 | <font size=-1><i>SAXO Documentation Assistant</i>: <a href="./../home.html">Overview</a></font></td> |
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51 | <td width="10%" align="right"> |
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52 | <a href="saveimage.html"><img src="./../next.gif" border="0" alt="Next"></a></td> |
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53 | </tr> |
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54 | </table> |
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55 | |
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56 | |
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57 | <h1><font size="-2">Picture/</font></h1> |
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58 | <h2>imdisp.pro</h2> |
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59 | |
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60 | <dl> |
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61 | </dl> |
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62 | |
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63 | |
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64 | Display an image on the current graphics device. |
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65 | IMDISP is an advanced replacement for <a href="/Applications/rsi/idl_6.3/help/online_help/TV.html">TV</a> and |
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66 | <a href="/Applications/rsi/idl_6.3/help/online_help/TVSCL.html">TVSCL</a>. |
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67 | |
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68 | - Supports WIN, MAC, X, CGM, PCL, PRINTER, PS, and Z graphics devices, |
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69 | - Image is automatically byte-scaled (can be disabled), |
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70 | - Custom byte-scaling of Pseudo color images via the RANGE keyword, |
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71 | - Pseudo (indexed) color and True color images are handled automatically, |
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72 | - 8-bit and 24-bit graphics devices are handled automatically, |
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73 | - Decomposed color settings are handled automatically, |
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74 | - Image is automatically sized to fit the display (can be disabled), |
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75 | - The !P.MULTI system variable is honored for multiple image display, |
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76 | - Image can be positioned via the POSITION keyword, |
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77 | - Color table splitting via the BOTTOM and NCOLORS keywords, |
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78 | - Image aspect ratio customization via the ASPECT keyword, |
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79 | - Resized images can be resampled (default) or interpolated, |
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80 | - Top down image display via the ORDER keyword (!ORDER is ignored), |
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81 | - Selectable display channel (R/G/B) via the CHANNEL keyword, |
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82 | - Background can be set to a specified color via the BACKGROUND keyword, |
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83 | - Screen can be erased prior to image display via the ERASE keyword, |
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84 | - Plot axes can be drawn on the image via the AXIS keyword, |
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85 | - Photographic negative images can be displayed via the NEGATIVE keyword. |
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86 | |
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87 | |
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88 | |
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89 | |
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90 | |
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91 | <a name="#_imdisp"></a> |
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92 | |
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93 | <h2>imdisp <font size="-1" color="#006633"> |
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94 | Picture |
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95 | </font></h2> |
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96 | |
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97 | <p><font face="Courier">imdisp<i>, <a href="#_imdisp_keyword_IMAGE">IMAGE</a></i>, <a href="#_imdisp_keyword_RANGE">RANGE</a>=<i>vector</i>, <a href="#_imdisp_keyword_BOTTOM">BOTTOM</a>=<i>BOTTOM</i>, <a href="#_imdisp_keyword_NCOLORS">NCOLORS</a>=<i>NCOLORS</i>, <a href="#_imdisp_keyword_MARGIN">MARGIN</a>=<i>MARGIN</i>, <a href="#_imdisp_keyword_INTERP">INTERP</a>=<i>INTERP</i>, <a href="#_imdisp_keyword_DITHER">DITHER</a>=<i>DITHER</i>, <a href="#_imdisp_keyword_ASPECT">ASPECT</a>=<i>ASPECT</i>, <a href="#_imdisp_keyword_POSITION">POSITION</a>=<i>POSITION</i>, <a href="#_imdisp_keyword_OUT_POS">OUT_POS</a>=<i>OUT_POS</i>, <a href="#_imdisp_keyword_NOSCALE">NOSCALE</a>=<i>NOSCALE</i>, <a href="#_imdisp_keyword_NORESIZE">NORESIZE</a>=<i>NORESIZE</i>, <a href="#_imdisp_keyword_ORDER">ORDER</a>=<i>ORDER</i>, <a href="#_imdisp_keyword_USEPOS">USEPOS</a>=<i>USEPOS</i>, <a href="#_imdisp_keyword_CHANNEL">CHANNEL</a>=<i>CHANNEL</i>, <a href="#_imdisp_keyword_BACKGROUND">BACKGROUND</a>=<i>BACKGROUND</i>, <a href="#_imdisp_keyword_ERASE">ERASE</a>=<i>ERASE</i>, <a href="#_imdisp_keyword_AXIS">AXIS</a>=<i>AXIS</i>, <a href="#_imdisp_keyword_NEGATIVE">NEGATIVE</a>=<i>NEGATIVE</i>, <a href="#_imdisp_keyword__EXTRA">_EXTRA</a>=<i>_EXTRA</i></font></p> |
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98 | |
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99 | |
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100 | |
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101 | |
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102 | |
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103 | |
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104 | |
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105 | <h3>Parameters</h3> |
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106 | |
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107 | |
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108 | <a name="#_imdisp_keyword_IMAGE"></a> |
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109 | <h4>IMAGE |
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110 | <font size="-1" color="#006633">in</font> |
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111 | |
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112 | |
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113 | <font size="-1" color="#006633">required</font> |
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114 | |
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115 | |
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116 | |
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117 | |
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118 | </h4> |
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119 | |
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120 | |
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121 | Array containing image data. |
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122 | Pseudo (indexed) color images must have 2 dimensions. |
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123 | True color images must have 3 dimensions, in either |
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124 | [3, NX, NY], [NX, 3, NY], or [NX, NY, 3] form. |
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125 | |
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126 | |
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127 | |
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128 | |
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129 | |
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130 | <h3>Keywords</h3> |
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131 | |
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132 | |
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133 | <a name="#_imdisp_keyword_RANGE"></a> |
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134 | <h4>RANGE |
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135 | |
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136 | |
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137 | |
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138 | |
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139 | |
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140 | <font size="-1" color="#006633">type:</font> <font size="-1" color="#006633"><i>vector</i></font> |
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141 | <font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i>min and max array values</i></font> |
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142 | |
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143 | </h4> |
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144 | |
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145 | |
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146 | For Pseudo Color images only, a vector with two elements |
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147 | specifying the minimum and maximum values of the image |
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148 | array to be considered when the image is byte-scaled |
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149 | This keyword is ignored for True Color images, |
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150 | or if the NOSCALE keyword is set. |
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151 | |
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152 | |
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153 | <a name="#_imdisp_keyword_BOTTOM"></a> |
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154 | <h4>BOTTOM |
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155 | |
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156 | |
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157 | |
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158 | |
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159 | |
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160 | |
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161 | <font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i>0</i></font> |
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162 | |
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163 | </h4> |
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164 | |
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165 | |
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166 | Bottom value in the color table to be used |
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167 | for the byte-scaled image. |
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168 | This keyword is ignored if the NOSCALE keyword is set. |
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169 | |
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170 | |
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171 | <a name="#_imdisp_keyword_NCOLORS"></a> |
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172 | <h4>NCOLORS |
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173 | |
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174 | |
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175 | |
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176 | |
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177 | |
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178 | |
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179 | <font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i>!D.TABLE_SIZE - BOTTOM</i></font> |
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180 | |
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181 | </h4> |
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182 | |
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183 | |
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184 | Number of colors in the color table to be used |
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185 | for the byte-scaled image |
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186 | This keyword is ignored if the NOSCALE keyword is set. |
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187 | |
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188 | |
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189 | <a name="#_imdisp_keyword_MARGIN"></a> |
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190 | <h4>MARGIN |
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191 | |
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192 | |
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193 | |
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194 | |
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195 | |
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196 | |
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197 | <font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i>0.1 or 0.025 if !P.MULTI is set to display multiple images</i></font> |
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198 | |
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199 | </h4> |
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200 | |
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201 | |
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202 | A scalar value specifying the margin to be maintained |
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203 | around the image in normal coordinates |
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204 | |
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205 | |
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206 | <a name="#_imdisp_keyword_INTERP"></a> |
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207 | <h4>INTERP |
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208 | |
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209 | |
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210 | |
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211 | |
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212 | |
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213 | |
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214 | <font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i>nearest neighbor sampling</i></font> |
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215 | |
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216 | </h4> |
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217 | |
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218 | |
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219 | If set, the resized image will be interpolated using |
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220 | bilinear interpolation |
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221 | |
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222 | |
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223 | <a name="#_imdisp_keyword_DITHER"></a> |
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224 | <h4>DITHER |
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225 | |
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226 | |
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227 | |
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228 | |
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229 | |
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230 | |
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231 | <font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i>no dithering</i></font> |
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232 | |
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233 | </h4> |
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234 | |
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235 | |
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236 | If set, true color images will be dithered when displayed |
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237 | on an 8-bit graphics device |
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238 | |
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239 | |
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240 | <a name="#_imdisp_keyword_ASPECT"></a> |
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241 | <h4>ASPECT |
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242 | |
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243 | |
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244 | |
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245 | |
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246 | |
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247 | |
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248 | <font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i>maintain native aspect ratio</i></font> |
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249 | |
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250 | </h4> |
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251 | |
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252 | |
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253 | A scalar value specifying the aspect ratio (height/width) |
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254 | for the displayed image |
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255 | |
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256 | |
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257 | <a name="#_imdisp_keyword_POSITION"></a> |
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258 | <h4>POSITION |
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259 | |
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260 | |
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261 | |
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262 | |
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263 | |
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264 | |
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265 | <font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i> [0.0,0.0,1.0,1.0]</i></font> |
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266 | |
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267 | </h4> |
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268 | |
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269 | |
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270 | On input, a 4-element vector specifying the position |
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271 | of the displayed image in the form [X0,Y0,X1,Y1] in |
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272 | in normal coordinates |
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273 | See the examples below to display an image where only the |
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274 | offset and size are known (e.g. MAP_IMAGE output). |
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275 | |
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276 | |
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277 | <a name="#_imdisp_keyword_OUT_POS"></a> |
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278 | <h4>OUT_POS |
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279 | |
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280 | |
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281 | |
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282 | |
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283 | |
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284 | |
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285 | |
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286 | |
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287 | </h4> |
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288 | |
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289 | |
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290 | On output, a 4-element vector specifying the position |
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291 | actually used to display the image. |
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292 | |
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293 | |
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294 | <a name="#_imdisp_keyword_NOSCALE"></a> |
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295 | <h4>NOSCALE |
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296 | |
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297 | |
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298 | |
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299 | |
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300 | |
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301 | |
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302 | <font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i>to byte-scale the image</i></font> |
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303 | |
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304 | </h4> |
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305 | |
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306 | |
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307 | If set, the image will not be byte-scaled. |
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308 | |
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309 | |
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310 | <a name="#_imdisp_keyword_NORESIZE"></a> |
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311 | <h4>NORESIZE |
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312 | |
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313 | |
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314 | |
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315 | |
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316 | |
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317 | |
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318 | <font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i>To resize the image to fit the display</i></font> |
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319 | |
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320 | </h4> |
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321 | |
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322 | |
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323 | If set, the image will not be resized. |
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324 | |
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325 | |
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326 | <a name="#_imdisp_keyword_ORDER"></a> |
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327 | <h4>ORDER |
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328 | |
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329 | |
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330 | |
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331 | |
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332 | |
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333 | |
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334 | <font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i>To display the image from the bottom up</i></font> |
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335 | |
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336 | </h4> |
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337 | |
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338 | |
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339 | If set, the image is displayed from the top down |
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340 | Note that the system variable !ORDER is always ignored. |
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341 | |
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342 | |
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343 | <a name="#_imdisp_keyword_USEPOS"></a> |
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344 | <h4>USEPOS |
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345 | |
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346 | |
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347 | |
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348 | |
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349 | |
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350 | |
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351 | <font size="-1" color="#006633">default:</font> <font size="-1" color="#006633"><i>To honor ASPECT and MARGIN when POSITION vector is supplied</i></font> |
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352 | |
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353 | </h4> |
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354 | |
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355 | |
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356 | If set, the image will be sized to exactly fit a supplied |
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357 | POSITION vector, over-riding ASPECT and MARGIN. |
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358 | |
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359 | |
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360 | <a name="#_imdisp_keyword_CHANNEL"></a> |
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361 | <h4>CHANNEL |
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362 | |
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363 | |
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364 | |
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365 | |
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366 | |
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367 | |
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368 | |
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369 | |
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370 | </h4> |
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371 | |
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372 | |
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373 | Display channel (Red, Green, or Blue) to be written. |
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374 | 0 => All channels (the default) |
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375 | 1 => Red channel |
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376 | 2 => Green channel |
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377 | 3 => Blue channel |
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378 | This keyword is only recognized by graphics devices which |
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379 | support 24-bit decomposed color (WIN, MAC, X). It is ignored |
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380 | by all other graphics devices. However True color (RGB) |
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381 | images can be displayed on any device supported by IMDISP. |
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382 | |
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383 | |
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384 | <a name="#_imdisp_keyword_BACKGROUND"></a> |
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385 | <h4>BACKGROUND |
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386 | |
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387 | |
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388 | |
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389 | |
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390 | |
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391 | |
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392 | |
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393 | |
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394 | </h4> |
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395 | |
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396 | |
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397 | If set to a positive integer, the background will be filled |
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398 | with the color defined by BACKGROUND. |
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399 | |
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400 | |
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401 | <a name="#_imdisp_keyword_ERASE"></a> |
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402 | <h4>ERASE |
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403 | |
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404 | |
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405 | |
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406 | |
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407 | |
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408 | |
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409 | |
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410 | |
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411 | </h4> |
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412 | |
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413 | |
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414 | If set, the screen contents will be erased. Note that if |
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415 | !P.MULTI is set to display multiple images, the screen is |
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416 | always erased when the first image is displayed. |
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417 | |
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418 | |
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419 | <a name="#_imdisp_keyword_AXIS"></a> |
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420 | <h4>AXIS |
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421 | |
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422 | |
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423 | |
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424 | |
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425 | |
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426 | |
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427 | |
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428 | |
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429 | </h4> |
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430 | |
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431 | |
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432 | If set, plot axes will be drawn on the image. The default |
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433 | x and y axis ranges are determined by the size of the image. |
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434 | When the AXIS keyword is set, IMDISP accepts any keywords |
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435 | supported by PLOT (e.g. TITLE, COLOR, CHARSIZE etc.). |
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436 | |
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437 | |
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438 | <a name="#_imdisp_keyword_NEGATIVE"></a> |
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439 | <h4>NEGATIVE |
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440 | |
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441 | |
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442 | |
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443 | |
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444 | |
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445 | |
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446 | |
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447 | |
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448 | </h4> |
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449 | |
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450 | |
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451 | If set, a photographic negative of the image is displayed. |
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452 | The values of BOTTOM and NCOLORS are honored. This keyword |
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453 | allows True color images scanned from color negatives to be |
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454 | displayed. It also allows Pseudo color images to be displayed |
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455 | as negatives without reversing the color table. This keyword |
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456 | is ignored if the NOSCALE keyword is set. |
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457 | |
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458 | |
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459 | <a name="#_imdisp_keyword__EXTRA"></a> |
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460 | <h4>_EXTRA |
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461 | |
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462 | |
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463 | |
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464 | |
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465 | |
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466 | |
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467 | |
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468 | |
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469 | </h4> |
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470 | |
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471 | |
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472 | |
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473 | |
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474 | |
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475 | <h3>Examples</h3><pre> |
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476 | |
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477 | ;- Load test data |
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478 | |
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479 | openr, lun, filepath('ctscan.dat', subdir='examples/data'), /get_lun |
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480 | ctscan = bytarr(256, 256) |
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481 | readu, lun, ctscan |
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482 | free_lun, lun |
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483 | openr, lun, filepath('hurric.dat', subdir='examples/data'), /get_lun |
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484 | hurric = bytarr(440, 330) |
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485 | readu, lun, hurric |
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486 | free_lun, lun |
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487 | read_jpeg, filepath('rose.jpg', subdir='examples/data'), rose |
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488 | help, ctscan, hurric, rose |
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489 | |
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490 | ;- Display single images |
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491 | |
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492 | !p.multi = 0 |
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493 | loadct, 0 |
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494 | imdisp, hurric, /erase |
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495 | wait, 3.0 |
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496 | imdisp, rose, /interp, /erase |
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497 | wait, 3.0 |
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498 | |
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499 | ;- Display multiple images without color table splitting |
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500 | ;- (works on 24-bit displays only; top 2 images are garbled on 8-bit displays) |
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501 | |
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502 | !p.multi = [0, 1, 3, 0, 0] |
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503 | loadct, 0 |
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504 | imdisp, ctscan, margin=0.02 |
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505 | loadct, 13 |
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506 | imdisp, hurric, margin=0.02 |
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507 | imdisp, rose, margin=0.02 |
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508 | wait, 3.0 |
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509 | |
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510 | ;- Display multiple images with color table splitting |
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511 | ;- (works on 8-bit or 24-bit displays) |
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512 | |
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513 | !p.multi = [0, 1, 3, 0, 0] |
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514 | loadct, 0, ncolors=64, bottom=0 |
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515 | imdisp, ctscan, margin=0.02, ncolors=64, bottom=0 |
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516 | loadct, 13, ncolors=64, bottom=64 |
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517 | imdisp, hurric, margin=0.02, ncolors=64, bottom=64 |
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518 | imdisp, rose, margin=0.02, ncolors=64, bottom=128 |
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519 | wait, 3.0 |
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520 | |
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521 | ;- Display an image at a specific position, over-riding aspect and margin |
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522 | |
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523 | !p.multi = 0 |
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524 | loadct, 0 |
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525 | imdisp, hurric, position=[0.0, 0.0, 1.0, 0.5], /usepos, /erase |
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526 | wait, 3.0 |
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527 | |
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528 | ;- Display an image with axis overlay |
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529 | |
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530 | !p.multi = 0 |
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531 | loadct, 0 |
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532 | imdisp, rose, /axis, /erase |
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533 | wait, 3.0 |
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534 | |
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535 | ;- Display an image with contour plot overlay |
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536 | |
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537 | !p.multi = 0 |
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538 | loadct, 0 |
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539 | imdisp, hurric, out_pos=out_pos, /erase |
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540 | contour, smooth(hurric, 10, /edge), /noerase, position=out_pos, $ |
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541 | xstyle=1, ystyle=1, levels=findgen(5)*40.0, /follow |
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542 | wait, 3.0 |
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543 | |
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544 | ;- Display a small image with correct resizing |
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545 | |
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546 | !p.multi = 0 |
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547 | loadct, 0 |
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548 | data = (dist(8))[1:7, 1:7] |
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549 | imdisp, data, /erase |
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550 | wait, 3.0 |
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551 | imdisp, data, /interp |
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552 | wait, 3.0 |
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553 | |
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554 | ;- Display a true color image without and with interpolation |
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555 | |
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556 | !p.multi = 0 |
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557 | imdisp, rose, /erase |
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558 | wait, 3.0 |
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559 | imdisp, rose, /interp |
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560 | wait, 3.0 |
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561 | |
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562 | ;- Display a true color image as a photographic negative |
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563 | |
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564 | imdisp, rose, /negative, /erase |
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565 | wait, 3.0 |
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566 | |
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567 | ;- Display a true color image on PostScript output |
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568 | ;- (note that color table is handled automatically) |
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569 | |
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570 | current_device = !d.name |
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571 | set_plot, 'PS' |
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572 | device, /color, bits_per_pixel=8, filename='imdisp_true.ps' |
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573 | imdisp, rose, /axis, title='PostScript True Color Output' |
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574 | device, /close |
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575 | set_plot, current_device |
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576 | |
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577 | ;- Display a pseudo color image on PostScript output |
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578 | |
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579 | current_device = !d.name |
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580 | set_plot, 'PS' |
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581 | device, /color, bits_per_pixel=8, filename='imdisp_pseudo.ps' |
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582 | loadct, 0 |
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583 | imdisp, hurric, /axis, title='PostScript Pseudo Color Output' |
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584 | device, /close |
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585 | set_plot, current_device |
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586 | |
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587 | ;- Display an image where only the offset and size are known |
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588 | |
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589 | ;- Read world elevation data |
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590 | file = filepath('worldelv.dat', subdir='examples/data') |
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591 | openr, lun, file, /get_lun |
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592 | data = bytarr(360, 360) |
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593 | readu, lun, data |
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594 | free_lun, lun |
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595 | ;- Reorganize array so it spans 180W to 180E |
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596 | world = data |
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597 | world[0:179, *] = data[180:*, *] |
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598 | world[180:*, *] = data[0:179, *] |
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599 | ;- Create remapped image |
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600 | map_set, /orthographic, /isotropic, /noborder |
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601 | remap = map_image(world, x0, y0, xsize, ysize, compress=1) |
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602 | ;- Convert offset and size to position vector |
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603 | pos = fltarr(4) |
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604 | pos[0] = x0 / float(!d.x_vsize) |
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605 | pos[1] = y0 / float(!d.y_vsize) |
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606 | pos[2] = (x0 + xsize) / float(!d.x_vsize) |
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607 | pos[3] = (y0 + ysize) / float(!d.y_vsize) |
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608 | ;- Display the image |
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609 | loadct, 0 |
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610 | imdisp, remap, pos=pos, /usepos |
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611 | map_continents |
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612 | map_grid |
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613 | |
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614 | </pre><h3>Version history</h3> |
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615 | |
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616 | <h4>Version</h4> |
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617 | $Id: imdisp.pro 262 2007-08-21 14:19:32Z pinsard $ |
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618 | |
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619 | <h4>History</h4> |
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620 | Liam.Gumley@ssec.wisc.edu |
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621 | <a href="http://cimss.ssec.wisc.edu/~gumley"/> |
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622 | |
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623 | Copyright (C) 1999, 2000 Liam E. Gumley |
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624 | |
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625 | This program is free software; you can redistribute it and/or |
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626 | modify it under the terms of the GNU General Public License |
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627 | as published by the Free Software Foundation; either version 2 |
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628 | of the License, or (at your option) any later version. |
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629 | |
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630 | This program is distributed in the hope that it will be useful, |
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631 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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632 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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633 | GNU General Public License for more details. |
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634 | |
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635 | You should have received a copy of the GNU General Public License |
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636 | along with this program; if not, write to the Free Software |
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637 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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638 | |
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639 | |
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640 | |
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641 | <h3>Known issues</h3> |
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642 | |
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643 | |
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644 | |
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645 | <h4>Restrictions</h4> |
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646 | The image is displayed on the current graphics device. |
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647 | |
---|
648 | |
---|
649 | Requires IDL 5.0 or higher (square bracket array syntax). |
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650 | |
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651 | |
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652 | |
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653 | |
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654 | |
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655 | |
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656 | |
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657 | |
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658 | |
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659 | |
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660 | <font size="-3"><p> </p></font> |
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661 | <hr size="1" color="#CCCCCC"/> |
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662 | |
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663 | |
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664 | |
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665 | |
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666 | <p><font color="gray" size="-3"> Produced by IDLdoc 2.0.</font></p> |
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667 | |
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668 | </body> |
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669 | </html> |
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