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.
Blue sky, Deep blue sky, Polariser, and Blue sky with golden land, in a
Skies section after Essentials. Each darkens the colour mixer's azure and
blue bands and adds chroma to them — what a polarising filter does to a
clear sky — and brings the highlights down with it, so a white cloud does
not read as a cut-out against the deeper blue. The stronger ones nudge
azure towards blue and add dehaze.
They are looks and work only on the hues a sky occupies, so an overcast
frame is left nearly alone: there is no blue for them to deepen, and
tinting grey cloud blue would be worse than doing nothing. Tuned by eye on
the demo library's alpine and Manhattan frames, with an overcast Étretat
frame as the control.
dtourolle