imreadimreadcv2.imread()cv2.i

cv2.imread()

cv2.imshow()

cv2.imwrite()

Use the function cv2.imread() to read an image. The image should be in the working directory or a full path of image should be given.

Second argument is a flag which specifies the way image should be read.

cv2.IMREAD_COLOR : Loads a color image. Any transparency of image will be neglected. It is the default flag.

实际值为1，加载彩像。任何透明度的图像将被忽略(默认)

cv2.IMREAD_GRAYSCALE : Loads image in grayscale mode

实际值为0，灰度模式

cv2.IMREAD_UNCHANGED : Loads image as such including alpha channel

实际值为-1，加载图像，包括 Alpha 通道

1 0 -1

cv2.destroyAllWindows() # 消灭所有窗口

cv2.destroyAllWindow() # 消灭指定窗口

cv2.imwrite('name.png',img) # 保存图片

cv2.waitKey(0) # 等待时间 单位毫秒 0:无限等待

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