[gdal-dev] 24bit RGB colors raster (PNG or JPEG) to 256 colormap
TIF conversion
Mateusz Loskot
mateusz at loskot.net
Thu Dec 27 06:19:48 EST 2007
marcello ferrero wrote:
> I would like to know what GDAL "C" API function I have to use to convert 24bit RGB colors PNG/JPG images to
> 256 colormap (8 bits) TIF files. I understood this is possible with MapServer using IMAGEMODE=PC256 (converted using the color cube), but I need to do this from my "C" program (a Win32 viewer ) that is already using the gdal lib.
Marcello,
You can find all necessary instructions in the GDAL API Tutorial at
http://www.gdal.org/gdal_tutorial.html
Also, I'd suggest to take a look at sources of the gdal_translate
program, especially at how CreateCopy is used:
http://trac.osgeo.org/gdal/browser/trunk/gdal/apps/gdal_translate.cpp#L588
Cheers
--
Mateusz Loskot
http://mateusz.loskot.net
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