dtourolle
3f8f909e41
Every photograph with a colour-mixer saturation edit now renders differently: a raised band is stronger, most of all on muted colours. The mixer matched bands and judged saturation on scene-linear values, and scaled chroma by the same factor whatever a colour started at. Against the photographer's earlier exports of two looks (~90 photographs, their raws, by encoded hue), a sky band raised by 58 there lifted muted sky blues about 2.1×; here the mixer gave 1.15×, and less in the muted tones that carry most of a sky or a shadowed snowfield. Bands are now matched and saturation judged on display-encoded values. A raised band pushes muted colours hardest and tapers to nothing at full saturation, at a gain of 3.0, which at the same value lifts muted sky blues about as those exports did. Lowering saturation still scales every colour alike. Hue shifts work on the same encoded colour; luminance still scales in linear light. The bundled presets that use the mixer, and those whose colour was tuned against the default rendering, are rescaled to the amount of colour they had: Vivid 1.30, Vivid warm 1.30, Vivid landscape 1.38, Vivid, strong 1.45, Vivid portrait 1.15, Punch 1.12, Blue sky 1.08, Deep blue sky 1.12, Polariser 1.26, Blue sky, golden land 1.13 — mean CIELAB chroma over the default rendering, on 30 raws from the library. Negative values (skin protection) are left as written.
53 lines
1.7 KiB
Plaintext
53 lines
1.7 KiB
Plaintext
drpl 1
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# Skies: a bluer, deeper sky without touching the rest of the picture.
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#
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# Written against this pipeline, not derived from anybody's preset. Each
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# works the colour mixer's azure and blue bands — the hues a clear sky
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# occupies, 210° and 240° — darkening them and adding chroma, which is what
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# a polarising filter does to a sky and why it reads as "more blue" rather
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# than "more saturated". A grey sky has no hue for the bands to find, so on
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# an overcast frame these do little, by construction: they cannot invent a
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# sky, and a preset that tinted grey clouds blue would be one nobody trusted.
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#
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# Highlights come down with the sky in the stronger ones, because a darker
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# blue beside a clipped white cloud looks like a mask edge.
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[preset Blue sky]
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colour_mixer.azure_lum = -20
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colour_mixer.azure_sat = 18
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colour_mixer.blue_lum = -15
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colour_mixer.blue_sat = 14
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highlights_shadows.highlights = -15
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[preset Deep blue sky]
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colour_mixer.azure_hue = 10
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colour_mixer.azure_lum = -30
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colour_mixer.azure_sat = 22
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colour_mixer.blue_lum = -25
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colour_mixer.blue_sat = 19
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colour_mixer.cyan_sat = 6
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highlights_shadows.highlights = -30
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[preset Polariser]
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colour_mixer.azure_hue = 10
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colour_mixer.azure_lum = -35
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colour_mixer.azure_sat = 29
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colour_mixer.blue_lum = -30
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colour_mixer.blue_sat = 26
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colour_mixer.cyan_lum = -10
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colour_mixer.cyan_sat = 11
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dehaze.amount = 20
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highlights_shadows.highlights = -35
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vibrance.vibrance = 7
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[preset Blue sky, golden land]
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colour_mixer.azure_lum = -20
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colour_mixer.azure_sat = 16
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colour_mixer.blue_lum = -15
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colour_mixer.blue_sat = 13
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colour_mixer.orange_sat = 8
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colour_mixer.yellow_hue = -10
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colour_mixer.yellow_sat = 10
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highlights_shadows.highlights = -20
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