Code used to generate the Python Turtle Bingo background, inspired by pottery painted using a color "splash"

python_turtle_bingo_background.py

from tqdm import tqdm
import numpy as np
from skimage.io import imsave


MAX_TILE_SIZE = 120
W, H = 1840, 4200
BACKGROUND = np.array([252, 250, 255], dtype=np.uint8)
SPLASH = np.array([60, 67, 117], dtype=np.uint8)
N = 10000
TILE_W = max(x for x in range(1, MAX_TILE_SIZE + 1) if W % x == 0)
TILE_H = max(x for x in range(1, MAX_TILE_SIZE + 1) if H % x == 0)
THRESHOLD = 1.3


def main():
    print(TILE_W, TILE_H)
    x_tiles = W // TILE_W
    y_tiles = H // TILE_H
    res = np.tile(BACKGROUND, (H, W, 1))

    splash_x = np.random.randint(W, size=N)
    splash_y = np.random.randint(H, size=N)
    r = 1 + 1 / (.045 + np.random.random(size=N))

    pbar = tqdm(desc='Constructing image', total=x_tiles * y_tiles)
    for row in range(y_tiles):
        ymin = row * TILE_H
        ymax = (row + 1) * TILE_H - 1
        for col in range(x_tiles):
            xmin = col * TILE_W
            xmax = (col + 1) * TILE_W - 1

            curr_res = np.tile(BACKGROUND, (TILE_H, TILE_W, 1))

            x = np.arange(xmin, xmax + 1)
            y = np.arange(ymin, ymax + 1)
            xx, yy = np.meshgrid(x, y)

            d = (
                np.sqrt((xx.ravel().reshape((-1, 1)) - splash_x.reshape((1, - 1))) ** 2 + (yy.ravel().reshape((-1, 1)) - splash_y.reshape((1, - 1))) ** 2).reshape((TILE_H, TILE_W, N))
            ) / r.reshape((1, 1, -1))
            mask = np.sqrt((1 / d ** 2).sum(axis=2)) >= THRESHOLD

            curr_res[mask] = SPLASH
            res[ymin:ymax + 1][:, xmin:xmax + 1] = curr_res

            pbar.update(1)

    imsave('???', res)


if __name__ == '__main__':
    main()