Bug 708567

Summary: pdf_rewrite_images delivers incomplete PNG images
Product: MuPDF Reporter: Jorj <jorj.x.mckie>
Component: mupdfAssignee: MuPDF bugs <mupdf-bugs>
Status: UNCONFIRMED ---    
Severity: normal    
Priority: P2    
Version: 1.26.1   
Hardware: All   
OS: All   
Customer: Word Size: ---

Description Jorj 2025-06-01 17:02:11 UTC 
PyMuPDF issue: https://github.com/pymupdf/PyMuPDF/issues/4539
Problem file link: https://github.com/pymupdf/PyMuPDF/blob/main/tests/resources/test_3594.pdf

The issue description contains a complete reproducing script. But setting these options values will lead to the result:

options.color_lossless_image_recompress_method = 3
options.color_lossless_image_recompress_quality = "33"
options.color_lossless_image_subsample_method = 0
options.color_lossless_image_subsample_threshold = 100
options.color_lossless_image_subsample_to = 72

Warnings generated indicate incomplete images:

premature end of data in flate filter
... repeated 3 times...