How does one convert a grayscale image to RGB in OpenCV (Python)?

Question

I\'m learning image processing using OpenCV for a realtime application. I did some thresholding on an image and want to label the contours in green, but they aren\'t showing

Answer 1

I am promoting my comment to an answer:

The easy way is:

You could draw in the original 'frame' itself instead of using gray image.

The hard way (method you were trying to implement):

backtorgb = cv2.cvtColor(gray,cv2.COLOR_GRAY2RGB) is the correct syntax.