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Claude
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Measured against the darkest frame on real ARW brackets, each frame is linear to 1 % up to the clip far from clipped pixels, but within 2 px of them the +2 EV frame's green reads 3–5 % low: demosaicing interpolates it from clipped photosites. That frame carries the most weight (k = 4) and those pixels were unclipped themselves, so they kept it, and bright windows took a magenta tinge. A frame's weight now goes by its brightest channel within 1 px (3 × 3; wider margins changed nothing more). On two real interior brackets (ILCE-7M3, 0 / −2 / +2 EV), bright pixels whose green against red and blue is over 10 % below the darkest frame's, in camera RGB: dining room 0.32 % → 0.08 %, kitchen 2.86 % → 0.28 %. Rendered at −3 EV with main's colour tags (#1123), window pixels with G < 0.85·min(R, B) go 50 → 3 and 16 → 10 (the darkest frame alone: 2 and 205); most of the visible magenta those brackets showed before came from the missing colour tags. Test: a bracket whose +2 EV frame has 5 % less green next to its clipped pixels merges without the deficit (fails before: −1.96 %). Docs: docs/merge.md, the LR-MERGE-HDR row, docs/whats-new.md (also for the frame-order fix). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015gRtdWF1E9358FfzhzYqCS