On Nov 13, 2009, at 8:23 AM, Christopher Barker wrote:
Michal Migurski wrote:
The GTiff files that I might see as input to this script include
palette and non-palette images,
This didn't work with palette images, for which I got an error
like: "ERROR 1: JPEGSetupEncode:PhotometricInterpretation 3 not
allowed for JPEG"
Enhanced error reporting would be great, but this particular issue
could (should) be addressed in another way.
It's a pretty common case that visual images can be stored either as
palette or RGB(A). However, when you want to re-size, or warp an
image, palette often doesn't work well -- you'll generally get a
better image if you allow interpolated (anti-aliased) colors.
In your case, I'd probably convert all the palette images to RGB,
then do your warping, which would solve your compression issue, as
well as give you better results.
It would be nice if GDAL could (optionally) do this on-the0fly
internally, when re-scaling or warping images, but I don't think it
can (am I wrong?)
Thanks for the suggestion. It makes sense, though it seems that
gdal_translate can't do this natively, is that true? I'm looking at
resources like http://w3.cs.jmu.edu/arch/schol/software/gdal-sup/All.html
and they seem to indicate that there's no native palette-to-RGB
conversion offered in gdal_translate, and I can't find any in the docs.
-mike.
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