Tiles an image and mirrors every other tile to make seamless transitions

mirror_tile_and_crop.py

from PIL import Image
from PIL.ImageOps import flip, mirror
import numpy as np

iseven = lambda x: (x % 2) == 0


def mirror_tile_crop(img: Image.Image, target_height=8192, target_width=8192) -> Image.Image:
    width, height = img.size

    width_repeat = int(np.ceil(target_width / width))
    height_repeat = int(np.ceil(target_height / height))

    out_image = Image.new('RGB', (width_repeat * width, height_repeat * height))

    for i in range(width_repeat):
        for j in range(height_repeat):
            temp_img = img.copy()
            if iseven(i):
                temp_img = mirror(temp_img)
            if iseven(j):
                temp_img = flip(temp_img)
            out_image.paste(temp_img, (i * width, j * height))

    return out_image.crop((0, 0, target_width, target_height))


mirror_tile_crop(Image.open('test.jpg')).save('test_tiled.jpg')