OpenCV: how to set alpha transparency of a pixel

Question

I have an image I am trying to segment by colouring each pixel either red green or blue. I have calculated a confidence score for each pixel and want to adjust the alpha tra

Answer 1

I've also had the same problem but when was drawing transparent shapes and solved it by blending images. I've fount this in OpenCV's documentation

if you want to paint semi-transparent shapes, you can paint them in a separate buffer and then blend it with the main image.

For this purpose I suggest you to take a look at this documentation article. Hope this will help.