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Hi<br><br>First of all, Thanks a lot: it works!<br><br>I've run those commands line:<br><br>/*For all pictures => it's a little bit repetitive:<br><i>gdal_translate -of GTiff -expand RGB -co compress=lzw SC25_TOPO_0850_6470_L93.tif 0850_6470.tif<br><br>gdalbuildvrt truc.vrt *.tif<br><br>gdal_translate -of GTiff truc.vrt truc.tif</i><br><br>But maybe you can explain somme things to me:<br>- what version of gdal, reports the issue?<br><br>- What does the option RGB do?<br><br>- What is PCT2RGB?<br><br>Best Regards<br>Fab<br><br><hr id="stopSpelling">Date: Tue, 10 Aug 2010 09:01:36 -0700<br>From: <a href="/user/SendEmail.jtp?type=node&node=5411388&i=0" target="_top" rel="nofollow">[hidden email]</a><br>To: <a href="/user/SendEmail.jtp?type=node&node=5411388&i=1" target="_top" rel="nofollow">[hidden email]</a><br>Subject: Re: [GDAL_TRANSLATE]Problem with colorimetry<br><br>
Fab,<br>
<br>
I found the problem.<br>
There were some differences in color tables of your images.
gdalbuildvrt application from the latest GDAL version reports the issue
when you try to build the vrt file. You're advised to preprocess your
rasters with other tools, such as pct2rgb.py or "gdal_translate -expand
RGB" to operate gdalbuildvrt on RGB rasters instead.<br>
<br>
The reason the red areas were occuring in different areas is that gdalbuildvrt considers only the first file's color table.<br><br><div class="ecxgmail_quote">On Tue, Aug 3, 2010 at 8:36 PM, Tacot <span dir="ltr"><<a rel="nofollow" target="_blank" link="external">[hidden email]</a>></span> wrote:<br>
<blockquote class="ecxgmail_quote" style="border-left: 2px solid rgb(204, 204, 204); padding: 0pt 1em;"><br>
I think more about the value of data.<br>
<a rel="nofollow" target="_blank" link="external">http://osgeo-org.1803224.n2.nabble.com/file/n5368754/PixelRed.jpg</a><br>
<br>
But it's not always the picture on the right which pixels become red; it can<br>
be also the picture on the left.<br>
I have the felling it depends on the range of merging.<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Best regards,<br>Chaitanya kumar CH.<br>/tʃaɪθənjə/ /kʊmɑr/ <br>+91-9494447584<br>17.2416N 80.1426E<br>
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