Image not displaying with imshow() OpenCV

问题

I'm getting a weird issue (but no error) when loading in an image and trying to display it. Here's the code I'm using:

import numpy as np  
import cv2  

# I'm using the full-path in the actual document   
img = cv2.imread('shapes.jpg')  
gray = cv2.imread('shapes.jpg',0)  

#not displaying anything currently  
cv2.imshow('gray', img)  
cv2.waitKey(0)  
cv2.destroyAllWindows()  

What I do get is the top part of a window. When using cv2.namedWindow('gray', cv2.WINDOW_NORMAL), I'm able to maximize the image and I can see that it does load the image, but it's surrounded by gray.

Any thoughts?

来源：https://stackoverflow.com/questions/44639948/image-not-displaying-with-imshow-opencv