Thanks Even!
This perfectly matches a task I have, and lets me cast half a dozen
scripts I've created with the pctrgb workaround into the compost bin. :)
matt wilkie
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Even Rouault wrote:
Folks,
just a few words to advertize the new capability of color table expansion that
has been added recently to GDAL trunk (1.6.0dev).
A new option of gdal_translate, -expand rgb|rgba, enables the user to ask for
the expansion of a single band dataset with a color table and its translation
to a 3 or 4 band dataset with the R,G,B,A components. Usefull for output
drivers such as JPEG, JPEG2000, MrSID, ECW that don’t support color indexed
datasets.
That capability relies on an extension of the VRTComplexSource that adds an
extra optionnal attribute
<ColorTableComponent>num_of_the_component</ColorTableComponent>.
You can use color table expansion to warp color indexed datasets with
resampling methods more sophisticated than simple nearest neighbour, without
an intermediate file that would have been produced by pct2rgb for example.
For example :
gdal_translate -of VRT -expand rgb color_indexed.tif color_expanded.vrt
gdalwarp -t_srs EPSG:32631 color_expanded.vrt color_expanded_warped.tif
Regards.
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