daylight.py

import cv2
import numpy as np

img = cv2.imread('Paris.jpg')
image_HLS = cv2.cvtColor(img,cv2.COLOR_BGR2HLS) # Conversion to HLS
image_HLS = np.array(image_HLS, dtype = np.float64)
daylight = 1.15
image_HLS[:,:,1] = image_HLS[:,:,1]*daylight # scale pixel values up for channel 1(Lightness)
image_HLS[:,:,1][image_HLS[:,:,1]>255]  = 255 # Sets all values above 255 to 255
image_HLS = np.array(image_HLS, dtype = np.uint8)
image_RGB = cv2.cvtColor(image_HLS,cv2.COLOR_HLS2BGR) # Conversion to RGB
cv2.imshow("original", img)
cv2.imshow("Output", image_RGB)
cv2.waitKey(0)
cv2.destroyAllWindows()