plrgbhls: Convert RGB color to HLS

The PLplot Plotting Library: Programmer's Reference Manual
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### `plrgbhls`: Convert RGB color to HLS

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

Convert RGB color coordinates to HLS

`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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