HUE, SAT and LUM leave the colour row: behind an IMAGE divider they are
hslHue/hslSat/hslLum, seeded into the shader's band accumulator at full
weight for every hue, while the eight band chips keep picking which colour
the panel on the photo edits. The image lightness term stays ungated so a
frame drained to grey by -SAT still answers +LUM.
FRAME loses its NO FRAME chip: pressing the frame already on the photo
takes it off.
ROTATE's quarter turns stop lighting the moment the fine angle leaves 0,
so the strip shows which of the two is steering the photo.
3dtours
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