h
(PLFLT, input) Hue, in degrees on the colour cone (0.0-360.0)
l
(PLFLT, input) Lightness, expressed as a fraction of the axis of the colour
cone (0.0-1.0)
s
(PLFLT, input) Saturation, expressed as a fraction of the radius of the
colour cone (0.0-1.0)
p_r
(PLFLT *, output) Pointer to red intensity (0.0-1.0) of the colour
p_g
(PLFLT *, output) Pointer to green intensity (0.0-1.0) of the colour
p_b
(PLFLT *, output) Pointer to blue intensity (0.0-1.0) of the colour
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