Compute the channel values of a colour using the Cie-Yxy colour model.

Input parameters:

1. Cl → Colour to analyse.

Output parameters:

1. Y → Value of the Y or luminance channel in the $[0,100]$ range.
2. x → Value of the x channel in the $[0,1]$ range.
3. y → Value of the y channel in the $[0,1]$ range.