Error when trying to display image via OpenCV

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What i’m trying to do with this is to display only the blue present in this image

import glob
import cv2
import numpy as np

boundaryh = np.array([[[76,40,0]]])
boundaryl = np.array([[[124,64,0]]])
images = np.array([cv2.imread(file) for file in glob.glob('C:\\Users\\Usuario\\Desktop\\IMG_HERE\\*.jpg')])
bmask = cv2.inRange(images,boundaryl,boundaryh)
dout = cv2.bitwise_and(images,images,bmask)
print("works")
cv2.imshow("bluedetector",dout)
cv2.waitKey(0)

When this code is executed it returns this error. I found a similar question but it doesn’t answer my issue

Traceback (most recent call last):
  File "C:\Users\Usuario\PycharmProjects\pythonProject\main.py", line 11, in <module>
    cv2.imshow("bluedetector",dout)
cv2.error: OpenCV(4.8.0) D:\a\opencv-python\opencv-python\opencv\modules\highgui\src\window_w32.cpp:124: error: (-215:Assertion failed) bmi && width >= 0 && height >= 0 && (bpp == 8 || bpp == 24 || bpp == 32) in function 'FillBitmapInfo'

  • 1

    Does this answer your question? Why does cv2.imshow() result in error in Python?

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  • sort of? I checked other examples and it should output dout correctly without the path.

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  • You’re not checking if imread succeeds. It returns None when it fails. And when you pass that None into imshow you get that exact error message.

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