r
(PLFLT, output) Red intensity (0.0-1.0) of the colour
g
(PLFLT, output) Green intensity (0.0-1.0) of the colour
b
(PLFLT, output) Blue intensity (0.0-1.0) of the colour
p_h
(PLFLT *, input) Pointer to hue, in degrees on the colour cone (0.0-360.0)
p_l
(PLFLT *, input) Pointer to lightness, expressed as a fraction of the axis of the colour
cone (0.0-1.0)
p_s
(PLFLT *, input) Pointer to saturation, expressed as a fraction of the radius of the
colour cone (0.0-1.0)
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