The rail gains an HSL tab between FX and FRAME, and the tab opens the mixer
ported from the web studio: eight hue bands, each with hue/sat/lum knobs on a
-10..+10 ruler, plus three whole-image moves behind an IMAGE divider. Band
weights are linear tents anchored on HSL_BANDS and summing to 1 at every hue, so
neighbouring bands hand over at exactly half strength and no hue falls in a gap.
Pixels under 8% saturation are gated out of the weights (rgb2hsl calls a neutral
red, so an ungated one would ride the RED band), while the whole-image LUM move
is added after the gate and still lifts a picture that -SAT has pulled to grey.
The mixer runs last in TONE_SKSL, so a band edit is judged on the colour the user
actually sampled.
The eyedropper is library-only: PICK arms a layer over the picture, a tap reads
the rendered pixel off the canvas, points the ruler at the nearest band and
hangs a panel carrying that band's three knobs. A live preview has no pixel to
read, so in camera mode the chip greys out - the mixer itself still runs there,
which is why the camera worklet's tone buffer had to grow from 10 slots to 40: a
missed slot would have pushed NaN into every uniform and taken the whole tone
pass down, not just HSL.
HSL is a LITE feature (the web studio builds it for guests too), and MONOCHROME
switches the mixer off outright - a mono stock has no hue to select. Checked on a
Xiaomi thor against an 8-band chart: +10 whole-image HUE rotates all eight bands
by +30 deg, -10 on one band's SAT flattens that band and leaves the other seven
alone, and a whole-image -SAT drops the camera preview's mean chroma 13.7 -> 0.4
with +LUM still lifting it 116 -> 166. Cut as 1.2.4 / versionCode 6.
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