import os

s = (1920, 1080)
f = 0.5 ** (1/69)

j = 1
for x in range(5):
    w = 1920.0
    for i in range(69):
        w /= f
        width = int(w + 0.5)
        print("convert img2-%05d.png -resize %dx1080^ -gravity Center -extent 1920x1080 img-%05d.png" % (x, width, 4160 + j))
        os.system("convert img2-%05d.png -resize %dx1080^ -gravity Center -extent 1920x1080 img-%05d.png" % (x, width, 4160 + j))
        j += 1