I have ValueError in Python script

Question

Here is my short code:

from cv2 import cv2

img = cv2.imread("1.png")

print("Высота:"+str(img.shape[0]))
print("Ширина:" + str(img.shape[1]))
print("Количество каналов:" + str(img.shape[2]))

if img[0, 0] == (255, 255, 255):
    print("Yes")

But I have an error:

Traceback (most recent call last):
  File "e:\Projects\Captcha Decrypt\main.py", line 9, in <module>
    if img[0, 0] == [255, 255, 255]:
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

Can you solve this problem?

Funpy97 · Accepted Answer · 2021-06-05 12:52:37Z

2

Just change your img[0][0] in list(img[0][0]):

from cv2 import cv2

img = cv2.imread("1.png")

print("Высота:"+str(img.shape[0]))
print("Ширина:" + str(img.shape[1]))
print("Количество каналов:" + str(img.shape[2]))

if list(img[0][0]) == [255, 255, 255]:
    print("Yes")

else:
    print("No")

answered Jun 5, 2021 at 12:52

Funpy97

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Comments

Shunya · Accepted Answer · 2021-06-05 12:45:55Z

Your object img is a 3D array. This means that img[x,y] will be a vector, so if you try to compare it, the comparison will check the condition for each element in the vector.
As it is an array, the return will also be an array array([True, True]) if the condition matches.
The error message you got already gave you a valid solution that you can use: call .all() on the resulting vector, which will check whether the condition is true for all elements in the array.

The correct piece of code would be:

if (img[0, 0] == (255, 255, 255)).all():
    print("Yes")

Another possible solution would be using numpy array equality (cv2 uses numpy for arrays so it works for you too):

import numpy as np

if np.logical_all(img[0, 0] == (255, 255, 255)):
    print("Yes")

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