Alpha blending is the process of overlaying a foreground image on a background image.
We take these two images to blend :
gfg.png
apple.jpeg
Steps :
- First, we will import OpenCV.
- We read the two images that we want to blend.
- The images are displayed.
- We have a while loop that runs while the choice is 1.
- Enter an alpha value.
- Use cv2.addWeighted() to add the weighted images.
- We display and save the image as alpha_{image}.png.
- To continue and try out more alpha values, press 1. Else press 0 to exit.
Python3
import cv2 img1 = cv2.imread('gfg.png')img2 = cv2.imread('apple.jpeg') img2 = cv2.resize(img2, img1.shape[1::-1]) cv2.imshow("img 1",img1) cv2.waitKey(0) cv2.imshow("img 2",img2) cv2.waitKey(0) choice = 1 while (choice) : alpha = float(input("Enter alpha value")) dst = cv2.addWeighted(img1, alpha , img2, 1-alpha, 0) cv2.imwrite('alpha_mask_.png', dst) img3 = cv2.imread('alpha_mask_.png') cv2.imshow("alpha blending 1",img3) cv2.waitKey(0) choice = int(input("Enter 1 to continue and 0 to exit")) |
Outputs:
alpha = 0.8
alpha = 0.5
Alpha masking:
We can create a black and white mask from an image with a transparent background.
Python3
import cv2im = cv2.imread("spectacles.png", cv2.IMREAD_UNCHANGED)_, mask = cv2.threshold(im[:, :, 3], 0, 255, cv2.THRESH_BINARY)cv2.imwrite('mask.jpg', mask) |
Output:
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