<div>Hi Jed,</div>
<div> </div>
<div>I've got the same problem with my TIFFs, but in my case they are 24bit RGB images. I tried to adjust the colors and then merge them. I even convert them to 8bit images with LUTs, but I failed.</div>
<div> </div>
<div>AFAIK, you can merge them together under the RGB model with the GDAL commands like:</div>
<div> </div>
<div>1. pct2rgb.py</div>
<div>2. gdal_merge.py</div>
<div>3. rgb2pct.py<br> </div>
<div>but I don't know if this really works. IMO, you may get some troubles with the command rgb2pct.py.</div>
<div> </div>
<div>help this can help.</div>
<div> </div>
<div>zhonghai <br> </div>
<div><span class="gmail_quote">On 7/4/06, <b class="gmail_sendername">Jed O. Kaplan</b> <<a href="mailto:jed.kaplan@ips.unibe.ch">jed.kaplan@ips.unibe.ch</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Hello all,<br><br>I have a series of geotiff files that are 8-bit paletted pseudocolor<br>images. Unfortunately each separate image file has a different color
<br>table, though they are a sort of DRGs so the original scans have<br>approximately all the same colors.<br><br>I would like to convert all the images to have a standard color<br>table, so that, e.g., I can merge the files into a single image,
<br>perform GIS operations, etc.<br><br>Is there any way using GDAL tools or the API that I can give all of<br>my individual images the same color table? The image files are large<br>(ca. 2000x3000 pixels), but I can convert them temporarily to full
<br>color rgb images and then reduce the colors. I have a standard color<br>table in another geotiff file.<br><br>I have tried to do this using the imagemagick tool: convert -map<br><file> <infile> <outfile> but this process is impossibly slow.
<br><br>Any suggestions for (standardized, semi-automated) color reduction<br>for DRG's would be much appreciated.<br><br>Thanks,<br><br>Jed Kaplan<br>_______________________________________________<br>Gdal-dev mailing list
<br><a href="mailto:Gdal-dev@lists.maptools.org">Gdal-dev@lists.maptools.org</a><br><a href="http://lists.maptools.org/mailman/listinfo/gdal-dev">http://lists.maptools.org/mailman/listinfo/gdal-dev</a><br></blockquote></div>
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