from tqdm import tqdm

def optimize(pxls, back):
	old_len = len(pxls)

	new_pxls = []
	for i in tqdm(range(old_len)):
		el = pxls[i]
		now_back = [el[2], el[3], el[4]]

		if now_back != back:
			new_pxls.append(pxls[i])

	print(f"Optimized {(old_len - len(new_pxls)) / old_len * 100 }%")

	return new_pxls