How to create mask from alpha channel in OpenCV?

Question

I need to make a black and white mask for seamless clone, I have a png image, I need to convert it like these photos.

I didn’t find the cut photo, just imagine that there is a transparent background behind, it needs to be filled in black, and the girl in white

James · Accepted Answer · 2019-09-12 05:26:45Z

6

Assuming your background is 100% transparent, the following example gives you a single channel mask with the dimensions of the image. Replaced 'girl.png' with the filename of your image.

import cv2
im = cv2.imread("girl.png", cv2.IMREAD_UNCHANGED)
ret, mask = cv2.threshold(im[:, :, 3], 0, 255, cv2.THRESH_BINARY)

answered Sep 12, 2019 at 5:26

James

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