連番のPNG画像をまとめてPDF化するスクリプト（A5）

convert_images_to_pdf.py

#! /usr/bin/env python3
# -*- coding: utf-8 -*-

from reportlab.pdfgen import canvas
from reportlab.pdfbase import pdfmetrics
# from reportlab.rl_config import defaultPageSize
from reportlab.lib.pagesizes import A5, landscape
from reportlab.pdfbase.cidfonts import UnicodeCIDFont
from reportlab.lib.units import cm

# Pillow
from PIL import Image
from pathlib import Path


class PdfConfig:
    # ほとんど不要
    title = "No title"
    author = ""
    subject = ""

    default_fontname = "HeiseiKakuGo-W5"
    image_resolution = 300
    jpeg_quality = 95
    font_adjustment = 0.85
    image_embeded = True

    def __init__(self):
        pass

if __name__ == '__main__' :

    output_filename = 'output_new.pdf' #出力ファイル名固定

    config = PdfConfig()

    newPdfPage = canvas.Canvas(output_filename)
    newPdfPage.setPageSize(A5)

    newPdfPage.saveState() # 念の為

    newPdfPage.setAuthor(config.author)
    newPdfPage.setTitle(config.title)
    newPdfPage.setSubject(config.subject)

    # 同じディレクトリのoutputディレクトリにPNG形式の画像があり、ファイル名が連番という前提（image-001.png...）
    pl = Path('./output').glob('image-*.png')


     # tiff file, PDF
    for i, p in enumerate(sorted(pl)):

        # 画像のサイズを確認するために必要
        with p.open('rb') as file :
            image = Image.open(file)

        imagefilename = str(p)
        print(f"start page: {i}")

        print("image size: {}".format(image.size))
        image_width , image_height = image.size

        page_size = {}

        newPdfPage.setPageSize(A5)
        page_size['width'], page_size['height'] = A5

        image_offset_x = 0
        image_offset_y = 0

        print("page size: {0}, {1}".format(page_size['width'], page_size['height']))
 

        newPdfPage.drawImage(imagefilename, 0+image_offset_x, 0+image_offset_y, width=page_size['width'],
                height=page_size['height'], preserveAspectRatio=True, anchor='c')

        newPdfPage.showPage()

    newPdfPage.save()