CMYK: all returned in range 0.0 - 1.0

def cmyk(self):
        """CMYK: all returned in range 0.0 - 1.0"""
        c, m, y = self.cmy
        k = min(c, m, y)

        # Handle division by zero in case of black = 1
        if k != 1:
            c = (c - k) / (1 - k)
            m = (m - k) / (1 - k)
            y = (y - k) / (1 - k)
        else:
            c, m, y = 1, 1, 1

        cmyk = (c, m, y, k)

        # Apply bound and return
        return tuple(map(lambda x: self._apply_float_bounds(x), cmyk))