import cv2
import numpy as np

def emptyFunction():
    pass

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)