acangi, Could you check if the after image shows any different colors with some other image viewer like ImageMagick? OpenEV might not be reading the color table correctly.
-- Chaitanya kumar CH. On Mon, Feb 16, 2009 at 7:43 PM, acangi <[email protected]> wrote: > > Subscription problem, reposting as requested. > > > acangi wrote: >> >> Hello, >> >> I try to translate colormapped geotiff files from EPSG:31300 to EPSG:3812, >> using >> >> $ gdalwarp -s_srs EPSG:31300 -t_srs "+proj=lcc +lat_1=49.83333333333334 >> +lat_2=51.16666666666666 +lat_0=50.79781500000000 +lon_0=4.359215833333335 >> +x_0=649328.0 +y_0=665262.0 +ellps=intl +units=m +no_defs" top250r.tif >> top250r_warp.tif >> >> Using -t_srs EPSG:3812 gives a "is this a valid coordinate system ?" >> Using -t_srs 3812.prj (file containing the WKT, taken from >> http://spatialreference.org/ref/epsg/3812/ogcwkt/ >> http://spatialreference.org/ ) gives a "No translation for Lambert Conic >> Conformal (2SP) to PROJ.4 is known" >> As I couldn't find the PROJ.4 syntax for this SRS, I built it based on >> data from the WKT. >> >> Coordinates transformation seems to work fine, but my colors are wrong: >> >> >> Before : http://n2.nabble.com/file/n2334758/before.jpeg >> After : http://n2.nabble.com/file/n2334758/after.jpeg >> >> Checking the files with gdalinfo, I see differences : >> >> Size is 18300, 15000 ==> Size is 18301, 15001 >> The projection, the origin and the corner coordinates change like expected >> Pixel Size = (16.666670000000000,-16.666699999999999) ==> Pixel Size = >> (16.666302967680906,-16.666302967680906) >> Metadata: >> AREA_OR_POINT=Area >> >> TIFFTAG_DOCUMENTNAME=\\backstage\jobcontainer1\symb\map250\tiff\plot_complet.tif >> TIFFTAG_SOFTWARE=Barco Graphics TIFFOut V1.0.2 >> TIFFTAG_XRESOLUTION=381 >> TIFFTAG_YRESOLUTION=381 >> TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch) >> ==> Metadata: >> AREA_OR_POINT=Area >> Image Structure Metadata:COMPRESSION=LZW INTERLEAVE=BAND ==> Image >> Structure Metadata: INTERLEAVE=BAND >> Band 1 Block=256x256 Type=Byte, ColorInterp=Palette ==> Band 1 >> Block=18301x1 Type=Byte, ColorInterp=Palette >> The color table is the same. >> >> I tried with some more options : -of GTiff -co "PROFILE=GeoTIFF" -co >> "INTERLEAVE=PIXEL" -co "COMPRESS=LZW" -co "TILED=YES" : >> Size is 18300, 15001 >> Yet another Pixel Size >> I get the "COMPRESSION=LZW" >> and Band 1 Block=256x256 Type=Byte, ColorInterp=Palette >> >> ...but the colors are still wrong. >> >> Any idea how I can change the projection without affecting the colors ? >> >> > > -- > View this message in context: > http://n2.nabble.com/gdalwarp-changes-colortable-tp2334758p2335001.html > Sent from the GDAL - Dev mailing list archive at Nabble.com. > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev > _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
