Print a list of images into a PDF file with two images per page.

print.py

import os
from fpdf import FPDF
from PIL import Image

input = os.environ["INPUT"]
output = os.environ["OUTPUT"]

images = os.listdir(input)
print(images)


def calc_image_size(image_file: str) -> (int, int):
    magic = 14.5
    max_width = int(13*magic)
    max_height = int(9*magic)
    image = Image.open(image_file)
    width, height = image.size
    print(f"original size: {width}, {height}")

    if max_width < width:
        height = int(height*(max_width/width))
        width = max_width

    if max_height < height:
        width = int(width*(max_height/height))
        height = max_height

    print(f"new size: {width}, {height}")
    return width, height


iter = 0
pdf = FPDF()
for image in images:
    file_name = f"{input}/{image}"
    print(f"processing {image}")
    width, height = calc_image_size(file_name)

    if iter % 2 == 0:
        pdf.add_page()
        pdf.image(file_name, 15, 5, width, height)
    else:
        pdf.image(file_name, 15, 155, width, height)

    iter += 1

pdf.output(f"{output}/test.pdf", "F")