def change_brightness(img, val):
    add_val = float(val/10.0)
    hsv = cv2.cvtColor(img, cv2.COLOR_RGB2BGR)
    mask = hsv[:,:, 2] * add_val
    v_channel = numpy.where(mask, 255, hsv[:,:,2] * add_val)
    hsv[:,:, 2] = v_channel
    return cv2.cvtColor(hsv, cv2.COLOR_HSV2BGR)


def cb(img, val):
    #img = 255 - img
    #img =  img + val > 255
    #blue = img[:,:,0]
    #img[:,:,0] += (val + (blue < 255)).astype(blue.dtype)
    #green = img[:,:,1]
    #img[:,:,1] += (val + (green < 255)).astype(green.dtype)
    #red = img[:,:,2]
    #img[:,:,2] += (val + (red < 255)).astype(red.dtype)


    mask = img + val
    channels = numpy.where(mask > 255, 255, img + val)
    img = channels
    return img