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select.colorRange takes {"select": "skinTones"}: a soft skin-tone model
in the YCbCr chroma plane (an ellipse along the skin run of Chai & Ngan,
1999) with a luminance gate, so near-black and near-white pixels drop
out. Fuzziness widens or narrows it as it does for Sampled Colors; the
selection modes, Invert and Sample All Layers work as for the other
presets. The dialog lists Skin Tones with Fuzziness enabled.
Detect Faces needs a face detector, which there is none of yet:
detectFaces: true is refused with a message instead of being ignored.
Fixes #4455