Fix broken TIFF with JPEG compression #2117
Merged
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JPEG compression was one of the cases where we fell back on the TIFFRGBAImage interface of libtiff. This worked for some JPEG images, but crashed on others, inside the TIFF library. Never did figure out why.
But do we really need to to use the RGBAImage interface? Turns out, no! At least, not if it's still a spectral RGB image.
So just using the regular interface for ordinary RGB JPEG-compressed TIFF images is fine, fixes the problem.
Also improved an error message while I was in there.