From f6ae1624bf2cb55d1bd10a14d6215c2414633e32 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hubert=20Figui=C3=A8re?= <hub@figuiere.net>
Date: Tue, 5 Jan 2021 15:23:48 -0500
Subject: [PATCH] Issue #164 - Fix TIFF saving when JPEG and posterized

---
 src/core/TiffWriter.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/core/TiffWriter.cpp b/src/core/TiffWriter.cpp
index 0713e05ad..f84be661c 100644
--- a/src/core/TiffWriter.cpp
+++ b/src/core/TiffWriter.cpp
@@ -222,8 +222,10 @@ bool TiffWriter::writeBitonalOrIndexed8Image(const TiffHandle& tif, const QImage
   }
 
   if (image.format() == QImage::Format_Indexed8) {
-    TIFFSetField(tif.handle(), TIFFTAG_COMPRESSION,
-                 uint16(ApplicationSettings::getInstance().getTiffColorCompression()));
+    uint16 compress = (photometric == PHOTOMETRIC_PALETTE) ?
+                      COMPRESSION_LZW :
+                      uint16(ApplicationSettings::getInstance().getTiffColorCompression());
+    TIFFSetField(tif.handle(), TIFFTAG_COMPRESSION, compress);
   } else {
     TIFFSetField(tif.handle(), TIFFTAG_COMPRESSION, uint16(ApplicationSettings::getInstance().getTiffBwCompression()));
   }