1 files changed, 66 insertions, 0 deletions
diff --git a/textproc/py-ocrmypdf/files/patch-src_ocrmypdf_optimize.py b/textproc/py-ocrmypdf/files/patch-src_ocrmypdf_optimize.py
new file mode 100644
index 000000000000..34e6453d57df
--- /dev/null
+++ b/textproc/py-ocrmypdf/files/patch-src_ocrmypdf_optimize.py
@@ -0,0 +1,66 @@
+From: "James R. Barlow" <james@purplerock.ca>
+Date: Sun, 9 Nov 2025 15:43:36 -0800
+Subject: [PATCH] Work around Ghostscript 10.6.0 JPEG encoding issue by forcing
+ optimization.
+
+Not an ideal fix, but it improves an issue affecting numerous users.
+
+Fixes 1585.
+
+Obtained from:
+
+https://github.com/ocrmypdf/OCRmyPDF/commit/f4c6c8121ba8178ff3a1cb8f70037bbc3a31391b.patch
+
+--- src/ocrmypdf/optimize.py.orig	2020-02-02 00:00:00 UTC
++++ src/ocrmypdf/optimize.py
+@@ -17,6 +17,7 @@ import img2pdf
+ from zlib import compress
+ 
+ import img2pdf
++from packaging.version import Version
+ from pikepdf import (
+     Dictionary,
+     Name,
+@@ -32,7 +33,7 @@ from ocrmypdf._concurrent import Executor, SerialExecu
+ from PIL import Image
+ 
+ from ocrmypdf._concurrent import Executor, SerialExecutor
+-from ocrmypdf._exec import jbig2enc, pngquant
++from ocrmypdf._exec import ghostscript, jbig2enc, pngquant
+ from ocrmypdf._jobcontext import PdfContext
+ from ocrmypdf._progressbar import ProgressBar
+ from ocrmypdf.exceptions import OutputFileAccessError
+@@ -189,6 +190,16 @@ def extract_image_jbig2(
+     return None
+ 
+ 
++def _should_optimize_jpeg(options, filtdp):
++    if options.optimize >= 2:
++        return True
++    if options.optimize < 2 and ghostscript.version() >= Version('10.6.0'):
++        # Ghostscript 10.6.0+ introduced some sort of JPEG encoding issue.
++        # To resolve this, re-optimize the JPEG anyway.
++        return True
++    return False
++
++
+ def extract_image_generic(
+     *, pdf: Pdf, root: Path, image: Stream, xref: Xref, options
+ ) -> XrefExt | None:
+@@ -202,15 +213,7 @@ def extract_image_generic(
+     if pim.bits_per_component == 1:
+         return None
+ 
+-    if filtdp[0] == Name.DCTDecode and options.optimize >= 2:
+-        # This is a simple heuristic derived from some training data, that has
+-        # about a 70% chance of guessing whether the JPEG is high quality,
+-        # and possibly recompressible, or not. The number itself doesn't mean
+-        # anything.
+-        # bytes_per_pixel = int(raw_jpeg.Length) / (w * h)
+-        # jpeg_quality_estimate = 117.0 * (bytes_per_pixel ** 0.213)
+-        # if jpeg_quality_estimate < 65:
+-        #     return None
++    if filtdp[0] == Name.DCTDecode and _should_optimize_jpeg(options, filtdp):
+         try:
+             imgname = root / f'{xref:08d}'
+             with imgname.open('wb') as f: