import cv2
import numpy as np
def passFunction(x):
pass
def main():
windowName = "OpenCV BGR Color Palette"
imageData = np.zeros((512, 512, 3), np.uint8)
cv2.namedWindow(windowName)
cv2.createTrackbar('Blue', windowName, 0, 255, passFunction)
cv2.createTrackbar('Green', windowName, 0, 255, passFunction)
cv2.createTrackbar('Red', windowName, 0, 255, passFunction)
while (True):
cv2.imshow(windowName, imageData)
if cv2.waitKey(1) & 0xFF == 27:
break
blue = cv2.getTrackbarPos('Blue', windowName)
green = cv2.getTrackbarPos('Green', windowName)
red = cv2.getTrackbarPos('Red', windowName)
imageData[:] = [blue, green, red]
print(blue, green, red)
cv2.destroyWindow(windowName)
if __name__ == '__main__':
main()
