opencv didn't output images correctly

问题

I have debugging my code and here is what I found:

img = cv2.resize(img, (224, 224))

cv2.imshow("img",img)
cv2.waitKey(0)
cv2.destroyAllWindows()

img = (img / 127.5) - 1

cv2.imshow("img",(127.5*(img+1)).astype(int))
cv2.waitKey(0)
cv2.destroyAllWindows()

these operations don't output the same picture even tough they are same, does somebody konow why?

回答1:

Try checking the dtype each time you display:

print(img.dtype)

来源：https://stackoverflow.com/questions/63371878/opencv-didnt-output-images-correctly