import cv2
o = cv2.imread('10.bmp')
#cv2.imshow("original",o)
gray = cv2.cvtColor(o,cv2.COLOR_BGR2GRAY)
cv2.namedWindow("result", 0)
cv2.resizeWindow("result", 400, 300) #设置窗口大小
cv2.imshow("result",gray)
cv2.imwrite("gray.bmp",gray)
cv2.waitKey()
cv2.destroyAllWindows()
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