| 
            plrgbhls
          ( | r , | 
| g , | |
| b , | |
| p_h , | |
| p_l , | |
| p_s ); | 
Convert RGB color coordinates to HLS
r
          (PLFLTRed intensity (0.0-1.0) of the color.
g
          (PLFLTGreen intensity (0.0-1.0) of the color.
b
          (PLFLTBlue intensity (0.0-1.0) of the color.
p_h
          (PLFLT_NC_SCALARReturned value of the hue in degrees (0.0-360.0) on the color cylinder.
p_l
          (PLFLT_NC_SCALARReturned value of the lightness expressed as a fraction (0.0-1.0) of the axis of the color cylinder.
p_s
          (PLFLT_NC_SCALARReturned value of the saturation expressed as a fraction (0.0-1.0) of the radius of the color cylinder.
Redacted form:
            General: plrgbhls(r, g, b, p_h, p_l, p_s)
          
This function is used in example 2.