drstats/merge_images.py

from PIL import Image
from pathlib import Path
import functools
import sys

printr = functools.partial(print, file=sys.stderr)

per_image_width = 480
per_image_height = 320
cols = 2

images = list(Path("./export/").glob("*.png"))
images.sort()
image_count = len(images)
total_image_height = image_count / cols * per_image_height
if image_count / cols * per_image_height > total_image_height:
    total_image_height += per_image_height
total_image_width = image_count / cols * per_image_width

resized_images = []

for path in images:
    image = Image.open(path)
    image = image.resize((per_image_width, per_image_height))
    resized_images.append((path, image))

new_image = Image.new(
    "RGB",
    (per_image_width * cols, int(per_image_height * image_count / cols)),
    (250, 250, 250),
)

current_col = 0
current_row = 0
current_image_number = 0
for path, image in resized_images:
    printr("Merging image {}".format(path))
    current_row = int(current_image_number / cols)
    left = int((current_col) * per_image_width)
    top = int(per_image_height * current_row)
    new_image.paste(image, (left, top))
    new_image.save("export/1_graphs_compliation.png")

    current_col += 1
    current_image_number += 1
    if current_col == cols:
        current_col = 0