Compute the channel values of a colour using the HSV colour model.

Input parameters:

1. Cl → Colour to analyse.

Output parameters:

1. H → Value of the hue channel in the $[0,360)$ range.
2. S → Value of the saturation channel in the $[0,1]$ range.
3. V → Value of the brightness channel in the $[0,1]$ range.