I m trying to convert the pixels which is painted black to another color but ı got a error l-CodePudding

import cv2
import numpy as np

image = cv2.imread('images1.png')

ss=[]

for x in range (0,260,1):

    for y in range(0,190,1):

        if image[y,x]==[0,0,0]:

            image[y,x]=[0,255,162]

cv2.imshow("image",image)

cv2.waitKey(0)

Error:

The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

CodePudding user response：

you're trying to compare an array with another when you call img[y,x]==[0,0,0] you got a vector of 3 logicals (supose [True,True,True] or any other variation). You have to compress this to an unique logical: you can use .all() to that (black means that the cannel red ==0 , the blue==0 and green==0, so you need that the 3 vals to be True to enter the if)

so the solution will be to replace

  if image[y,x]==[0,0,0]:

with

  if (image[y,x]==[0,0,0]).all():

CodePudding user response：

If you want to do this fast, you don't want to do this with a loop – instead, use
into this: