读写文件

# -*- coding:utf-8 -*-
import cv2

#读取图片
img = cv2.imread("Lena.png")

#显示图像
cv2.imshow("Demo", img)

#等待显示
cv2.waitKey(0)
cv2.destroyAllWindows()

#写入图像
cv2.imwrite("testyxz.jpg", img)

# -*- coding:utf-8 -*-
import cv2

#读取图片
img = cv2.imread("flower.png", cv2.IMREAD_UNCHANGED)
test = img[88,142]
print(test)
img[88,142] = [255, 255, 255]
print(test)

#分别获取BGR通道像素
blue = img[88,142,0]
print(blue)
green = img[88,142,1]
print(green)
red = img[88,142,2]
print(red)

#显示图像
cv2.imshow("Demo", img)

#等待显示
cv2.waitKey(0)
cv2.destroyAllWindows()

#写入图像
cv2.imwrite("testyxz.jpg", img)

import cv2

#读取图片
img = cv2.imread("flower.png", cv2.IMREAD_UNCHANGED)

#该区域设置为白色
img[100:200, 150:250] = [255,255,255]

#显示图像
cv2.imshow("Demo", img)

#等待显示
cv2.waitKey(0)
cv2.destroyAllWindows()

#写入图像
cv2.imwrite("testyxz.jpg", img)