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On the provided images (according to Color Quantizer):
021-fullsize-cleaned has only 221 colors
021 256-grayscale has 244 colors (!)
021-256-indexed has only 31 colors
236-fullsize-cleaned has only 247 colors
238-256-grayscale has 246 colors
238-256-indexed has only 31 colors
All of these seem strange to me. I expected the fullsize to have >256 colors and both the grayscale and indexed to have 255 (I suppose 240+ is close enough, but it seems strange).
I can't get either imagemagick or graphicsmagick to read the .jp2 files.
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