Projets_OpenCv/Trackba2.py at master · mohpython/Projets_OpenCv · GitHub

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from cv2 import createTrackbar
import numpy as np
import cv2 as cv

def print_callback(x):
    print(x)

# creater a black image, a window
img = np.zeros((300, 521, 3), np.uint8)
cv.namedWindow('image')

cv.createTrackbar('B', 'image', 0, 255, print_callback)
cv.createTrackbar('G', 'image', 0, 255, print_callback)
cv.createTrackbar('R', 'image', 0, 255, print_callback)

switch = '0 : OFF\n 1: ON'
cv.createTrackbar('switch', 'image', 0, 1, print_callback)


while True:
    cv.imshow('image',img)
    k=cv.waitKey(1) & 0xff
    if k==27:
        break

    b= cv.getTrackbarPos('B', 'image')
    g= cv.getTrackbarPos('G', 'image')
    r= cv.getTrackbarPos('R', 'image')
    s = cv.getTrackbarPos('switch', 'image')

    if s == 0:
        img[:] = 0
    else:
        img[:] = [b, g, r]

cv.destroyAllWindows()