Converts this to the HLS format.
The hue value is in the 0 .. 360 range. The luminance and saturation values are in the 0 .. 1
range.
| this |
a Color |
| hue |
return location for the hue value or null |
| saturation |
return location for the saturation value or null |
| luminance |
return location for the luminance value or null |