low-rgb-sub! | chickadee

low-rgb-sub! float*_in1 float*_in2 float*_outprocedure
low-rgb8-sub! uchar*_in1 uchar*_in2 uchar*_outprocedure
low-hsl-sub! float-in1 float*_in2 float*_outprocedure: Low-level versions of rgb-sub etc.

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