[Gdal-dev] Is there a GetRasterBandasRGB?

[Christopher Barker]

Hi all,

I've been starting to work with GDAL (mostly with the python bindings), 
and I've been very impressed, it's a very nice piece of work. I'm 
particularly thrilled with the BSB support.

What I need to do is be able to read any (ideally) form of 
geo-referenced raster image that GDAL supports, and then get a 24 bit 
RGB version of a given subset of the image.

I've found I can use GetRasterBand() to extract the data I want. 
However, I found myself having to write different versions of the code, 
depending on how the data was stored:

if is is a single band raster, with a ColorTable, I do one thing

If it's a three band raster, with RBG bands, I do another

etc.....

Those are the two I've supported so far, but then it downed on me that 
my needs can not be unique! this must be a pretty common problem.

So the question is, have I missed a function that extracts a subsection 
of the rasterdata, and converts it to RGB data for me? If it's not built 
in to GDAL, has anyone written such a thing, and/or would this be the 
kind of thing that you'd like to add, if I write it?

thanks,

-Chris








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Christopher Barker, Ph.D.
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