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Brandon ThomasandClaude Opus 5.5 0892148bab M5.3: faster per-pixel stage and row-parallel guided filter
- finish: sRGB encode through an interpolated 4096-entry table (< 2e-5 from the exact curve,
  tested), exp2 instead of powf(2, x).
- guided / guided_fast: coefficient and output passes run row-parallel (were serial loops);
  Image::zip_map.
- blur_bench reports process CPU time next to wall-clock (meaningful on a loaded machine).
- RENDER_CACHE_VERSION 3 (exposure-after-filters and the table change pixels by <= 2 LSB).

Co-Authored-By: Claude Opus 5.5 <[email protected]>
2026-10-01 00:57:02 -04:00
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