Add transparency to rectangles, circles, polgons, text or any shape drawn in OpenCV.

Transparent drawings in OpenCV.py

import cv2

image = cv2.imread('test.jpg')
overlay = image.copy()

x, y, w, h = 10, 10, 10, 10  # Rectangle parameters
cv2.rectangle(overlay, (x, y), (x+w, y+h), (0, 200, 0), -1)  # A filled rectangle

alpha = 0.4  # Transparency factor.

# Following line overlays transparent rectangle over the image
image_new = cv2.addWeighted(overlay, alpha, image, 1 - alpha, 0)

Thanks a lot!
is there a more efficient way of doing this? since copying a large image is computationally heavy when I want to draw it many times a second

i think open cv should implement this inside rectangle function as a parameter of transparency

i think open cv should implement this inside rectangle function as a parameter of transparency

Yup. Completely agree. This should be a straightforward thing yet we have to do it in a roundabout way currently.

Thanks :)

Man ! at last i found a simple solution. Lots of thanks. Allah bless you

Cheers!

This method works!

Nice & Thanks

very good very nice!

Appreciated!!

Legend!

You are a hero :)

Thank you so much!