HSL Shift artifacts
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kchapelier commented
Work on https://github.com/kchapelier/matcap-studio showed that the rgb2hsl function can introduce some artifacts when applied on some images. The issue was fixed by switching to Yi-wen Lin's implementation ( https://gist.github.com/yiwenl/745bfea7f04c456e0101 ).
kchapelier commented
Fixed with 6aef47b