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Correct what D20 claimed the profile tables would do for colour

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Measured after building them, on four of the library's 6D DNGs: Adobe
Standard's tables lower mean saturation by 3-9 % at defaults, and the
look at 200 % lowers it further. The 6D's look table scales saturation
by 0.925 in its darkest value rows; it was tuned to sit under Camera
Raw's default RGB tone curve, which DarkRoom does not apply, and the
dark-tone desaturation is what is left without it. On _MG_9080 the
Lightroom preview measures 0.49, the matrix alone 0.38, the profile
0.35.

So the spec's "that gap is most of why the same file looks flatter"
was wrong: the gap is tone. The tables stay — they put each hue where
Adobe put it — and the spec, D20 and the Vivid file now say so.
"Stronger camera look" is removed: a stronger Adobe Standard look is a
less saturated picture, the opposite of its name. The Vivid presets,
measured at 0.40-0.46 on the same frame, are what answers "more
colourful" today.
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dtourolle
2026-10-02 22:38:07 -04:00
parent 65c1f1a468
commit 54772f94d6
3 changed files with 35 additions and 19 deletions
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docs/dev/requirements.md
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@@ -2750,8 +2750,12 @@ operation at order 25, after exposure, converting into linear ProPhoto and back
fragment.** Design and the full argument: [camera-profiles.md](camera-profiles.md).
*Why now.* The library's 9,348 Canon 6D DNGs carry Adobe Standard's tables, which Lightroom
rendered them through, and DarkRoom ignored them. That gap is most of why the same file looks
flatter here.
rendered them through, and DarkRoom ignored them, so every hue on those files sat somewhere other
than where Lightroom put it. *Measured after building it:* the tables are not why Lightroom's
rendering looks richer — at defaults they lower mean saturation by 3–9 %, because Adobe Standard's
look desaturates dark tones to sit under Camera Raw's tone curve, which DarkRoom does not apply.
The richer colour is tone, and the Vivid presets (FR-DEV-6) are what answers it today
(camera-profiles.md §1).
*Why there.* The matrix snippet stays what D19 made it, and every copy of it (masks, picker,
camera-space tap) stays correct without changing. Hue and saturation are invariant under the