Como usar cv2.color_bgr2gray

def main():
	imagePath = "img.jpg"
	
	img = cv2.imread(imagePath)
	gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
	
	generate_histogram(gray)
	
	cv2.imwrite("before.jpg", gray)

	gray = cv2.equalizeHist(gray)
	
	generate_histogram(gray)
	
	cv2.imwrite("after.jpg",gray)
	
	return 0 
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