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

Try this:

import cv2
import cv

color_img = cv2.cvtColor(gray_img, cv.CV_GRAY2RGB)

I discovered, while using opencv, that some of the constants are defined in the cv2 module, and other in the cv module.