From 23c95e966011580398ecdd2bbae748693af03e2c Mon Sep 17 00:00:00 2001
From: "James R. Barlow" <jim@purplerock.ca>
Date: Thu, 10 Nov 2016 14:48:02 -0800
Subject: [PATCH] ghostscript: elide overprinting to fix PDF/A errors in GS
 9.20

It looks like GS 9.19 can incorrectly set overprinting for the text layer
even though this makes no sense in PDF/A, or at least someone produced
PDFs that have this after a Tesseract PDF -> GS PDF/A conversion. GS 9.20
complains about this. Instead of aborting, elide the feature.

See
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=094d5a1880f1cb9ed320ca9353eb69436e09b594
and
issue #107.

It looks like it is better to elide features and warn about elision rather
than abort with an error.
---
 ocrmypdf/ghostscript.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ocrmypdf/ghostscript.py b/ocrmypdf/ghostscript.py
index 39640c77..fb58c9e6 100644
--- a/ocrmypdf/ghostscript.py
+++ b/ocrmypdf/ghostscript.py
@@ -56,7 +56,7 @@ def generate_pdfa(pdf_pages, output_file, threads=1):
             "-sProcessColorModel=DeviceRGB",
             "-dJPEGQ=95",
             "-dPDFA=2",
-            "-sPDFACompatibilityPolicy=2",
+            "-sPDFACompatibilityPolicy=1",
             "-sOutputFile=" + gs_pdf.name,
         ]
         args_gs.extend(pdf_pages)