montage maker

import PIL
import math

from PIL import Image
import os

target_size = 4096

new_image = Image.new("RGBA", (target_size, target_size), None)

x = 1
y = 1

def get_path():
    path = "images/"
    return path

images = []


for path, dirs, files in os.walk(get_path()):

    for file_name in files:
        images.append(path + file_name)

images.sort(key=os.path.getmtime, reverse=False)
progress = 1

for image in images:

    side = round(math.sqrt(len(files))) + 2
    cell_size = int((target_size / int(side))  * 1.0)

    im = Image.open(image, "r")

    bbox = im.getbbox()

    x_size = bbox[2]
    y_size = bbox[3]

    multi = 1.0 / float(cell_size)

    scaler = float(y_size) * multi

    y_target = cell_size
    x_target = int(x_size / scaler)

    im = im.convert("RGB")

    im2 = im.resize((x_target, y_target), Image.ANTIALIAS)
    im3 =im.resize((640, 480), Image.ANTIALIAS)

    im3.save("export/progress_{}.png".format(progress), "PNG")
    progress += 1

    if x + x_target < target_size:
        new_image.paste(im2, (x, y))
        x += x_target
    else:
        y += cell_size
        x = 1
        new_image.paste(im2, (x, y))
        x += x_target

new_image.save("export/montage_output.png", "PNG")
print ("finished")