8000 RGBA PNG saved as PDF renders incorrectly in some applications · Issue #8074 · python-pillow/Pillow · GitHub
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RGBA PNG saved as PDF renders incorrectly in some applications #8074
@stefan6419846

Description

@stefan6419846

What did you do?

Convert a PNG file (screenshots created on Gnome and on Windows) to PDF.

What did you expect to happen?

The rendered PDF looks correct.

What actually happened?

The output looks correct in MuPDF and Chromium, but incorrect in Evince and pdf.js.

What are your OS, Python and Pillow versions?

  • OS: OpenSUSE Leap 15.4
  • Python: 3.9.18
  • Pillow: 10.3.0
--------------------------------------------------------------------
Pillow 10.3.0
Python 3.9.18 (main, Sep 06 2023, 07:49:32) [GCC]
--------------------------------------------------------------------
Python executable is /home/stefan/tmp/venv1/bin/python3
Environment Python files loaded from /home/stefan/tmp/venv1
System Python files loaded from /usr
--------------------------------------------------------------------
Python Pillow modules loaded from /home/stefan/tmp/venv1/lib64/python3.9/site-packages/PIL
Binary Pillow modules loaded from /home/stefan/tmp/venv1/lib64/python3.9/site-packages/PIL
--------------------------------------------------------------------
--- PIL CORE support ok, compiled for 10.3.0
*** TKINTER support not installed
--- FREETYPE2 support ok, loaded 2.13.2
--- LITTLECMS2 support ok, loaded 2.16
--- WEBP support ok, loaded 1.3.2
--- WEBP Transparency support ok
--- WEBPMUX support ok
--- WEBP Animation support ok
--- JPEG support ok, compiled for libjpeg-turbo 3.0.2
--- OPENJPEG (JPEG2000) support ok, loaded 2.5.2
--- ZLIB (PNG/ZIP) support ok, loaded 1.2.11
--- LIBTIFF support ok, loaded 4.6.0
--- RAQM (Bidirectional Text) support ok, loaded 0.10.1, fribidi 1.0.10, harfbuzz 8.4.0
*** LIBIMAGEQUANT (Quantization method) support not installed
--- XCB (X protocol) support ok
--------------------------------------------------------------------
from PIL import Image

Image.open("image2vu2shjb.png").save("out2.pdf")

Input:

image2vu2shjb

Output: out2.pdf

Rendered output from Evince:

ksnip_20240522-121933

Rendered output from pdf.js:

ksnip_20240522-121949

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