Comvert image folder to PDF

import os, re
from PIL import Image as image
from reportlab.pdfgen import canvas
from reportlab.lib.units import mm


maxpagesize = (210*mm, 297*mm) ## A4
maxpagesize = (139.5*mm, 194.5*mm) ## Boox

rotate = False # Allows page rotation


def convertfolder(folder, titlePrefix='', author='anonymous'):
    if folder.endswith(('/', '\\')):
        folder = folder[:-1]
    folder = re.sub('file:///', '/', folder)
    print('Proceeding the folder "%s"'%folder)

    filelist = []
    for a,b,c in os.walk(folder):
        for file in c:
            if (file[-4:].lower() =='.png' or
                file[-4:].lower() =='.jpg' or
                file[-5:].lower() =='.jpeg'):
                    filelist = filelist + [os.path.join(a, file)]

    filelist.sort()
    pdffilename = folder + '.pdf'
    print('PDF file name', pdffilename)
    c = canvas.Canvas(pdffilename, pagesize=maxpagesize)
    c.setTitle(titlePrefix+re.sub(r'\A.*[/\\]', '', folder))
    c.setAuthor(author)
    for f in filelist:
        with image.open(f) as i:
            imagesize = i.size
            if rotate and imagesize[0]>imagesize[1]:
                needsrotation = True
                imagesize = (imagesize[1], imagesize[0])
            else:
                needsrotation = False
            scale = min(maxpagesize[0]/imagesize[0], maxpagesize[1]/imagesize[1])
            pagesize = (scale*imagesize[0], scale*imagesize[1])
        c.setPageSize(pagesize)
        if needsrotation:
            c.rotate(90)
            c.drawImage(f, 0, -pagesize[0], pagesize[1], pagesize[0])
        else:
            c.drawImage(f, 0, 0, *pagesize)
        c.showPage()
    c.save()


def convertfolderlist(folderlist, titlePrefix='', author='anonymous'):
    folderlist = folderlist.split('\n')
    folderlist = [i for i in folderlist if i!='']
    for i in folderlist: convertfolder(i, titlePrefix, author)


if __name__=="__main__":
##    convertfolderlist("/home/hellerick/Documents/Akiba/Manga/Kannagi (mangatraders.org)/Volumes/Vol 01/Kannagi_-_Chapter_01/")
    convertfolderlist(r"""
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 01 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 02 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 03 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 04 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 05 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 06 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 07 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 08 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 09 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 10 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 11 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 12 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 13 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 14 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 15 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 16 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 17 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 18 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 19 (EN)
file:///home/hellerick/Documents/Akiba/Manga/Q/OZ. Suzumiya Haruhi no Yuuutsu/PDF/Suzumiya Haruhi no Yuuutsu. Vol 20 (EN)
""", titlePrefix = '', author='TANIGAWA Nagaru, ITOU Noiji, TSUGANO Gaku')
# the file paths can be entered with "file:///" or without it