perspective-shift/main.py

#!/usr/bin/env python3

import pyvips
import sys

print(sys.argv)

image = pyvips.Image.new_from_file(sys.argv[1], access="random")

# T = [
#     0.418385,
#     -0.064912,
#     1.11204e-12,
#     -1.07285e-16,
#     0.407118,
#     1.85136e-13,
#     -0.000143964,
#     -0.0000155811,
# ]

# T = [
#     2.39014,
#     0.381091,
#     -5.07071e-13,
#     8.09745e-16,
#     2.45629,
#     -1.95474e-12,
#     0.000344095,
#     0.0000931351,
# ]


T = list(map(float, sys.argv[2].split(",")))

i = pyvips.Image.xyz(image.width, image.height)

x = (i[0] * T[0] + i[1] * T[1] + T[2]) / (i[0] * T[6] + i[1] * T[7] + 1)
y = (i[0] * T[2] + i[1] * T[4] + T[5]) / (i[0] * T[6] + i[1] * T[7] + 1)

m = x.bandjoin(y)

image = image.mapim(m)

image.write_to_file(sys.argv[3])