BGR color palette

import cv2

import numpy as np

def emptyFunction():

pass

def main():

image = np.zeros((512, 512, 3), np.uint8)

windowName ="Open CV Color Palette"

cv2.namedWindow(windowName)

cv2.createTrackbar('Blue', windowName, 0, 255, emptyFunction)

cv2.createTrackbar('Green', windowName, 0, 255, emptyFunction)

cv2.createTrackbar('Red', windowName, 0, 255, emptyFunction)

while(True):

cv2.imshow(windowName, image)

if cv2.waitKey(1) == 27:

break

blue = cv2.getTrackbarPos('Blue', windowName)

green = cv2.getTrackbarPos('Green', windowName)

red = cv2.getTrackbarPos('Red', windowName)

image[:] = [blue, green, red]

print(blue, green, red)

cv2.destroyAllWindows()

if __name__=="__main__":

main()