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Color Accessibility Degradation

Status: draft Scope: sequential Leonardo-style degradation analysis for benchmark reference palettes Source: Reference Categorical Palette Corpus, raw prefix metrics

This note tracks how quickly benchmark palettes degrade from an accessibility perspective as colors are added in order. Each step uses the repo's local palette_deltae_checker.py logic and reports failures against the default Leonardo-style Delta E >= 11 pass bar across all simulated vision modes. Delta E is a perceptual distance metric: lower values mean colors are more likely to be confused, while higher values mean clearer separation.

Population-informed vision weights used for the main curve metric:

Color accessibility degradation