A recoloring UI can produce a convincing thumbnail while still failing a user's real task. The useful question is not only whether the selected object changes color, but whether the result remains understandable after export.

Disclosure: this checklist uses our product, Change Image Color , as an example. This article was prepared with AI assistance. It describes acceptance criteria, not measured performance results.

1. Separate selection correctness from color correctness

These are two different failure modes. A perfectly chosen target color does not fix a mask that includes the background. Conversely, a clean mask does not guarantee a pleasing color transform.

Keep a small collection of representative inputs: an object with holes, a printed logo that should remain unchanged, a shadowed area, and an object next to a similarly colored background.…