Fixed addition of fuzz for color chooser to avoid overflows #21
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It turns out that if you select a color close to the boundary values, you can end up getting an overflow:
This seems to leave things in a bit of a weird state, and I wasn't able to recover from it. It turns out the fix is to use cv2 helpers that automatically clip the values at the max / min. TBH I'm not sure how I haven't run into this before... but this should fix it.