使用 PyMuPDF 将 PDF 页面 Pixmap 保存为 PNG 时出现颜色问题

Question

I'm running the following bit of Python code from the PyMuPDF 1.16.17 documentation, which save PNG images for every page in a PDF file.

import sys, fitz  # import the binding
fname = "test.pdf" # get filename from command line
doc = fitz.open(fname)  # open document
for page in doc:  # iterate through the pages
    pix = page.getPixmap()
    pix.writePNG("F:/cynthia/page-%i.png" % page.number)  # store image as a PNG

The resulting PNG images' colors are off from the PDF originals (too saturated and high contrast). I know function Page.getPixmap() has a "colorspace" argument, and using Document.getPageImageList I found out that my PDF's colorspace is "DeviceCMYK". But when I try to get a Pixmap using CMYK as colorspace (replacing the pix = page.getPixmap() line with pix = page.getPixmap(colorspace="CMYK") or `pix = page.getPixmap(colorspace=csCMYK)), it doesn't change the resulting colors. Any help is appreciated.

Answer 1

Please upgrade your PyMuPDF version. Then ICC color support will be included which should improve your output.