Brandon ThomasandClaude Opus 5.5 bf877411fb Render: picture brightness with contrast as PowerPoint combines them ...

Brightness was added after the contrast stretch. Measured on PowerPoint's
export of grey ramps (5 x 5 grid of -80..80% brightness and contrast):
contrast scales about mid-grey (x(1+c) below zero, /(1-c) above) and
brightness adds b * 255 scaled by (1 + cf) / 2, half before the stretch
and half after; +40% brightness with +40% contrast maps black to 54, not
17. DeckCraft now matches the 25 ramps within 5 grey levels.

Wild synthetic set: brightness/contrast grid 15.93 -> 13.36, recolour
slide 8.74 -> 7.60.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

2026-10-13 08:16:41 -04:00

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src

Render: picture brightness with contrast as PowerPoint combines them

2026-10-13 08:16:41 -04:00

tests/fixtures

Emoji: drawn in colour, with families, skin tones and flags joined (#278)

2026-10-12 17:48:51 -04:00

Cargo.toml

Transitions like PowerPoint: measured frame by frame and retuned (#366)

2026-10-13 05:31:13 -04:00