@classmethod
def cmyk_to_rgb(Class, c, m, y, k):
    """CMYK in % to RGB in 0-255
        based on https://www.openprocessing.org/sketch/46231#
        """
    c = float(c) / 100.0
    m = float(m) / 100.0
    y = float(y) / 100.0
    k = float(k) / 100.0
    nc = c * (1 - k) + k
    nm = m * (1 - k) + k
    ny = y * (1 - k) + k
    r = int((1 - nc) * 255)
    g = int((1 - nm) * 255)
    b = int((1 - ny) * 255)
    return dict(r=r, g=g, b=b)
