I'm trying to invert a 16 color indexed greyscale bitmap with imaging lingo. I thought this would be a no brainer.
I first tried copyPixels with #notcopy ink. This appears to work, but there seem to be subtle rounding errors. Also tried #reverse ink against black, with similar rounding errors.
Have you tried changing the depth to 8 bits and doing it again?
Not yet, but seems like the next logical step. I was hoping I wouldn't have to change the depth. But I'll drop in a little profiling code, to see how much it hurts. Might turn out to be faster than the pixel thing, for all I know(?).
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