Re: [gdal-dev] gdal_translate produces tif with different colors as original
I noticed you're using ArcMap for visualizing the results. Did you check what histogram/gamma stretch gets applied by default when you load the layer? I run into this issue often as results from GDAL operations appear much worse when loaded into ArcMap compared to originals. When I turn off stretching, both histogram/gamma, results are nearly identical to original. -marius To: gdal-dev@lists.osgeo.org From: andre+jo...@nurfuerspam.de Date: Thu, 7 Nov 2013 16:54:32 +0100 Subject: Re: [gdal-dev] gdal_translate produces tif with different colors as original Am 06.11.2013 21:32, schrieb Jukka Rahkonen: 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. I proposed that, but have a look at the color palette of the VRT: http://gis.stackexchange.com/questions/76662/gdal-translate-produces-tif-with-different-colors-as-original Is it a fault of the source or the driver? Greetings, André Joost ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] gdal_translate produces tif with different colors as original
Am 06.11.2013 21:32, schrieb Jukka Rahkonen: 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. I proposed that, but have a look at the color palette of the VRT: http://gis.stackexchange.com/questions/76662/gdal-translate-produces-tif-with-different-colors-as-original Is it a fault of the source or the driver? Greetings, André Joost ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
Re: [gdal-dev] gdal_translate produces tif with different colors as original
Moses.Gone at t-systems.com writes: Hello List, I am using SDE as my raster data source with the ultimate goal to tile this dataset: I am running the following gdal_translate command to generate the initial VRT: gdal_translate -projwin 390605 5588320 410128 5568805 -a_srs EPSG:25832 -a_nodata none -of vrt SDE:server,5153,db,user,pw,table,image clippedvrt.vrt Tiling the resultant VRT produces tiff with weird colors. The colors are either intensified or totally different from the original as you can see from the attached test results https://drive.google.com/file/d/0Bw-iJv3cImO7bkZYRVZERi1rTTg/edit?usp=sharing could someone shade some light as to what might be happening. Hi, I have seen something similar when I have created a VRT file from one paletted image but the following images have used different palettes which were optimized for each image. Now the palette of the first image was written into the VRT file and when it was applied to the other images the result looked pretty funny. In my case I used the gdalbuildvrt tool which gave me a helpful warning and a useful hint: The end result might produce weird colors. 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. Perhaps you have somehow similar situation. -Jukka Rahkonen- ___ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
