plrgbhls.3plplot man page

plrgbhls — Convert RGB color to HLS


plrgbhls(r, g, b, p_h, p_l, p_s)


Convert RGB color coordinates to HLS

Redacted form: General: plrgbhls(r, g, b, p_h, p_l, p_s) Perl/PDL: Not available? Implemented as plrgb/plrgb1?

This function is used in example 2.


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


Many developers (who are credited at http://plplot.sourceforge.net/credits.p…) have contributed to PLplot over its long history.

See Also

PLplot documentation at http://plplot.sourceforge.net/documenta….


PLplot API August, 2015