From 710fa82fb087ce77e5b6bed7a1fb91ea834a268d Mon Sep 17 00:00:00 2001
From: zdenop <zdenop@gmail.com>
Date: Sun, 27 Oct 2019 14:15:12 +0100
Subject: [PATCH] fix inverting (Bilevel BW png) in pdf; fixes # 2059

---
 src/api/pdfrenderer.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/api/pdfrenderer.cpp b/src/api/pdfrenderer.cpp
index 79ba14937..9d5034e3d 100644
--- a/src/api/pdfrenderer.cpp
+++ b/src/api/pdfrenderer.cpp
@@ -721,7 +721,12 @@ bool TessPDFRenderer::imageToPDFObj(Pix *pix,
   } else {
     switch (cid->spp) {
       case 1:
-        colorspace.str("  /ColorSpace /DeviceGray\n");
+        if (cid->bps == 1) {
+          colorspace.str("  /ColorSpace /DeviceGray\n"
+                         "  /Decode [1 0]\n");
+        } else {
+          colorspace.str("  /ColorSpace /DeviceGray\n");
+        }
         break;
       case 3:
         colorspace.str("  /ColorSpace /DeviceRGB\n");