Compute the hexadecimal description and byte channel values of a colour using the standard RGB colour model.

Input parameters:

1. Cl → Colour to analyse.

Output parameters:

1. Ri → Value of the red channel in the $[0,255]$ range.
2. Gi → Value of the green channel in the $[0,255]$ range.
3. Bi → Value of the blue channel in the $[0,255]$ range.
4. Hx → HTML compliant hexadecimal descriptor of the colour.