Python-openCV查看图像像素值

#showPixelValue.py

import cv2
import sys
          
def main(imgName):

  img= cv2.imread(imgName)          
  def onmouse(event, x, y, flags, param):   
    if event==cv2.EVENT_MOUSEMOVE:     
      print(img[y,x]) 
      
  cv2.namedWindow("img")         
  cv2.setMouseCallback("img", onmouse)   
  cv2.imshow("img",img)        
  if cv2.waitKey() == ord('q'): #按下‘q'键，退出
    cv2.destroyAllWindows()         
  
if __name__ == '__main__':          
  arg1 = sys.argv[1]
  main(arg1)

Run:
python showPixelValue.py imgPath