[#37] Surface color_error (mean Lab ΔE) in the report — step 1#96
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…ted channel only SSIM is largely structural: it scored a faceless shiba 0.923 and ignores hue shifts. Add verify.color_error (mean CIE76 dE at a 256px sample) and report it alongside similarity. The loop still optimizes SSIM and pass/fail is unchanged (blending + --quality recalibration is the gated step 2). One extra rasterize per convert at report time; contract JSON gains the color_error key. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This was referenced Jul 13, 2026
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Step 1 of #37 (reported channel only — zero behavior change).
verify.color_error(original, rendered): mean CIE76 ΔE in Lab at a 256px-long-edge sample. ~0–2 imperceptible, >6 clearly visible.Report.color_error+ contract JSON key (contract test updated); computed once at report time (one extra rasterize).passed_thresholdunchanged. Step 2 (blend into the loop score +--qualityrecalibration) stays gated — it changes every conversion's behavior and needs the corpus + operator eye-gate.Tests: hue-shift fixture ΔE>20 while identical <0.5; report carries the field end-to-end. ruff + 140 green. Real-world: cat sample reports
color_erroralongside similarity.🤖 Generated with Claude Code