slider.py

import cv2


def BrightnessContrast(brightness=0):

	# getTrackbarPos returns the
	# current position of the specified trackbar.
	brightness = cv2.getTrackbarPos('Brightness',
									'GEEK')
	
	# contrast = cv2.getTrackbarPos('Contrast',
	# 							'GEEK')
	
	# effect = controller(img,
	# 					brightness,
	# 					contrast)

	# The function imshow displays
	# an image in the specified window
	# cv2.imshow('Effect', effect)


if __name__ == '__main__':
    # The function imread loads an
    # image from the specified file and returns it.
    # original = cv2.imread("pic.jpeg")

    # Making another copy of an image.
    # img = original.copy()

    # The function namedWindow creates
    # a window that can be used as
    # a placeholder for images.
    cv2.namedWindow('GEEK')

    # The function imshow displays
    # an image in the specified window.
    # cv2.imshow('GEEK', original)

    # createTrackbar(trackbarName,
    # windowName, value, count, onChange)
    # Brightness range -255 to 255
    cv2.createTrackbar('Brightness', 'GEEK',0, 300,BrightnessContrast)

    # # Contrast range -127 to 127
    # cv2.createTrackbar('Contrast', 'GEEK',
    #                    127, 2 * 127,
    #                    BrightnessContrast)

    BrightnessContrast(0)

# The function waitKey waits for
# a key event infinitely or for
# delay milliseconds, when it is positive.
cv2.waitKey(0)