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Victor KuznetsovandClaude Opus 5 af51afb586 Document how the face stage actually composites
The parameter names invite a misreading. _run_faces regenerates the ENTIRE
expanded crop with Z-Image and only then cross-fades on a blurred SAM mask, so
the generation is conditioned on a fully noised neighbourhood and the pixels the
mask later discards were regenerated too.

Records the alternative that has never been tried here - passing the mask into
the sampler as a latent noise mask, so only masked pixels are denoised and the
edge transition happens inside the generation - because the face stage is the
largest measured quality contributor, worth 3.5 dB and 6.1 dB inside the face
boxes on the two fixtures that have one.

Also records that FACE_DENOISE_SCALE = 0.5 is coupled to this compositing choice
rather than independently calibrated: regenerating a whole crop and blending is
stronger than masked denoising, so changing the compositing without revisiting
the scale would move output strength by about a factor of two.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-02 20:44:20 -07:00
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