Convert PDF file to multipage image

Question

I'm trying to convert a multipage PDF file to image with PyMuPDF:

pdffile = "input.pdf"
doc = fitz.open(pdffile)
page = doc.loadPage()  # number of page
pix = page.getPixmap()
output = "output.tif"
pix.writePNG(output)

But I need to convert all the pages of the PDF file to a single image in multi-page tiff, when I give the page argument a page range, it just takes one page, does anyone know how I can do it?

Answer 1

import fitz
from PIL import Image

input_pdf = "input.pdf"
output_name = "output.tif"
compression = 'zip'  # "zip", "lzw", "group4" - need binarized image...

zoom = 2 # to increase the resolution
mat = fitz.Matrix(zoom, zoom)

doc = fitz.open(input_pdf)
image_list = []
for page in doc:
    pix = page.getPixmap(matrix = mat)
    img = Image.frombytes("RGB", [pix.width, pix.height], pix.samples)
    image_list.append(img)
    
if image_list:
    image_list[0].save(
        output_name,
        save_all=True,
        append_images=image_list[1:],
        compression=compression,
        dpi=(300, 300),
    )