I'm on it. On Mon, Feb 1, 2010 at 5:16 PM, Jan Hartmann <j.l.h.hartm...@uva.nl> wrote:
> Hi Frank, could this be added to the documentation? > > Jan > > > On 1-2-2010 12:37, Frank Warmerdam wrote: > >> Luuk Schaminee wrote: >> >>> Hi, >>> >>> I am trying to convert a 24 bit RGB TIFF file to a 8 bit TIFF file. >>> Without the –pct option this works perfectly but I want to control the >>> created colors with a palette file. So I tried the following command: >>> rgb2pct -pct c:\color_file.txt c:\image.tif e:\new_image.tif. >>> >> ... >> >>> So now my question. What format must the palette file be in? and can you >>> give me a working example. >>> >> >> Luuk, >> >> The palette must be in a GDAL supported raster file format (ie. TIFF, >> PNG, GIF, etc). Likely the easiest format for you to prepare manually >> would be VRT format. The following VRT is one with a small color table >> and no actual raster data: >> >> >> <VRTDataset rasterXSize="226" rasterYSize="271"> >> <Metadata/> >> <VRTRasterBand dataType="Byte" band="1"> >> <ColorInterp>Palette</ColorInterp> >> <ColorTable> >> <Entry c1="238" c2="238" c3="238" c4="255"/> >> <Entry c1="237" c2="237" c3="237" c4="255"/> >> <Entry c1="236" c2="236" c3="236" c4="255"/> >> <Entry c1="229" c2="229" c3="229" c4="255"/> >> </ColorTable> >> </VRTRasterBand> >> </VRTDataset> >> >> The c1/c2/c3/c4 entries are the red, green, blue and alpha components >> of color entries. You can have up to 256 entries in a normal file. >> >> Best regards, >> > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Best regards, Chaitanya kumar CH. /tʃaɪθənjə/ /kʊmɑr/ +91-9848167848 17.241582N 80.142635E
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