import os
import cv2

folder = "0_tmp_for_copy"
folder_out = "tmp_renamed"
filelist = os.listdir(folder)
print(len(filelist))

counter = 1
for i in range(835):
    filename = folder + "/" + str(i).zfill(6) + ".png"
    res = cv2.imread(filename)
    print('saving to file: ', folder_out + "/" + str(counter + 834).zfill(6) + ".png")
    cv2.imwrite(folder_out + "/" + str(counter + 834).zfill(6) + ".png", res)
    cv2.imshow("out", res)
    key = cv2.waitKey(1)
    counter += 1