Hi ImMobile, I'm presuming you're doing this in Python. Have you changed or added any __int__ functions? The __int__ functions provided do set a width attribute in the Image class.

Traceback:

        in

        in set_random_background_colours

AttributeError: 'Central_Pixels_Test' object has no attribute 'width'
I think, that it should to be an issue in your "set_random_background_colours" function. Very nice Kata, but i cannot to pass it due to that issue :(