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Building a color replacer: why RGB matching fails on photos and how HSV fixes it

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By Irrational Apps
| DEV Community
I've been building browser-based image tools for a while now, and color replacement is one of those features that seems simple on the surface but hides a lot of interesting problems. I want to write about the main one: why the obvious approach (RGB distance matching) fails on real photos, and how HSV fixes it. Plus some notes on shading preservation, edge detection, and where intelligent scissors fit in.
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