import cv2
import numpy as np
img=cv2.imread('/home/duan/workspace/opencv/images/roi.jpg')
px=img[100,100]
print(px)
blue=img[100,100,0]
print(blue)
## [57 63 68]
## 57
难道是
img[100,100,0]--> 57
img[100,100,1]--> 63
img[100,100,2]--> 68
???请指教