如何在Python中使用第二个图像作为透明二进制蒙版合并两个图像？

Question

For example I have a image of a cat, and second image with a mask of cat. And I want to add transparent red mask for pixels of a cat in first image. Both images are numpy arrays...So how to do it?

Answer 1

IIUC you could do something like this -

img[:,:,2] = np.where(mask,255,img[:,:,2])

Results -