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Exalted5373andClaude Opus 5.5
b5440f167f
Canon's SensorInfo left border is not where light starts: on every corpus body 10-36 columns left of it already hold image (EOS 6D: masked columns 0-70, border 84), and the black level was averaged over all of them. The 6D read 2591 instead of 2047 (4 % of the range), so CR2s rendered dark with crushed shadows; 40D +141, 5DS R +131, 5D Mark II +73. The masked run is now measured from the data: columns whose mean stays within 1/256 of the range of the leftmost columns', minus a two-column margin. Against Lightroom Classic (EOS 6D still life, 2000 px, ΔE00): base 7.63 -> 5.23 (p95 24.7 -> 11.3); mean over 86 edit variants abs 9.13 -> 6.19, effect 3.09 -> 2.75. RENDER_CACHE_VERSION 23. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>