OpenCV – Remove Blue Channel from Image
To remove blue channel from color image, read image to BGR array using cv2.imread() and assign zeros to the 2D array corresponding to blue channel.
In this tutorial, we shall use OpenCV Python library and transform an image, such that no red channel is present in the image.
Example 1: Remove Blue Component from Image
In this example, we will remove the blue channel from the following image.
import cv2 import numpy as np #read image src = cv2.imread('D:/original.png', cv2.IMREAD_UNCHANGED) print(src.shape) # assign blue channel to zeros src[:,:,0] = np.zeros([src.shape, src.shape]) #save image cv2.imwrite('D:/no-blue-channel.png',src)
This image has only red and green channels of the source image.
In this tutorial of Python Examples, we learned how to remove blue channel from an image.