Read the pixel value of a certain pixel
#读取图片
img = cv2.imread("E:/code/conputer_visual/data/0.jpg", 1)
#读取坐标(100，100)的像素值
(b, g, r) = img[100,100]
#打印像素值
print(b, g, r)
216 240 145
Modify the pixel value of some pixels
import cv2
img = cv2.imread("E:/code/conputer_visual/data/0.jpg", 1)
for i in range(220):
#将图片宽度200，高度0-220的像素点改为蓝色
img[i, 200] = (255, 0, 0)
cv2.imshow("image_window", img)
cv2.waitKey()
