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How to create trackbar in Opencv Python?

Create trackbar in Opencv and Python


import cv2
import numpy as np


def func(x):
  pass


img = cv2.imread("flower.jpg")
cv2.namedWindow('image')

cv2.createTrackbar('R','image', 0, 255, func)
cv2.createTrackbar('G','image', 0, 255, func)
cv2.createTrackbar('B','image', 0, 255, func)

switch = '0 : OFF \n1 : ON'
cv2.createTrackbar(switch, 'image', 0, 1, func)
while(1):
  cv2.imshow('image',img)
  k = cv2.waitKey(1) & 0xFF
  if k == 27:
    break

  r = cv2.getTrackbarPos('R','image')
  g = cv2.getTrackbarPos('G','image')
  b = cv2.getTrackbarPos('B','image')
  s = cv2.getTrackbarPos(switch,'image')
  if s == 0:
   img[:] = 0
  else:
   img[:] = [b,g,r]
cv2.destroyAllWindows()
Trackbar


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