# compute the desired right eye x-coordinate based on the
        # desired x-coordinate of the left eye
        desiredRightEyeX = 1.0 - self.desiredLeftEye[0]

        # determine the scale of the new resulting image by taking
        # the ratio of the distance between eyes in the *current*
        # image to the ratio of distance between eyes in the
        # *desired* image
        dist = np.sqrt((dX ** 2) + (dY ** 2))
        desiredDist = (desiredRightEyeX - self.desiredLeftEye[0])
        desiredDist *= self.desiredFaceWidth
        scale = desiredDist / dist