Change/Augment brightness of an image using OpenCV

augment_brightness.py

import cv2
import numpy as np


def augment_brightness(img, scale):
    img = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
    h, s, v = cv2.split(img)
    scale = 0.5
    v = np.clip(v * scale, 0, 255, out=v)
    img = cv2.merge((h, s, v))
    img = cv2.cvtColor(img, cv2.COLOR_HSV2BGR)
    return img


if __name__ == '__main__':
    IMG_PATH = r"C:\Users\WILSONCYP\Pictures\image.jpg"
    frame = cv2.imread(IMG_PATH)
    edited = augment_brightness(frame, 0.5)  # increasing the second argument brightens, decreasing darkens
    cv2.imshow("raw", frame)
    cv2.imshow("edited", edited)
    if cv2.waitKey(0) == 27:
        cv2.destroyAllWindows()