# import cv2
# import numpy as np
#
# # 回调函数，x表示滑块的位置，本例暂不使用
# def nothing(x):
# pass
#
# img = np.zeros((300, 512, 3), np.uint8)
# cv2.namedWindow('image')
#
# # 创建RGB三个滑动条
# cv2.createTrackbar('R', 'image', 0, 255, nothing)
# cv2.createTrackbar('G', 'image', 0, 255, nothing)
# cv2.createTrackbar('B', 'image', 0, 255, nothing)
#
# while(True):
# cv2.imshow('image', img)
# if cv2.waitKey(1) == 27:
# break
#
# # 获取滑块的值
# r = cv2.getTrackbarPos('R', 'image')
# g = cv2.getTrackbarPos('G', 'image')
# b = cv2.getTrackbarPos('B', 'image')
# # 设定img的颜色
# img[:] = [b, g, r]
