From a70da8112dc10713072e11552b3b7bbdcdb34d3d Mon Sep 17 00:00:00 2001
From: Christoph Gohlke <cjgohlke@gmail.com>
Date: Thu, 27 Jun 2019 23:55:01 -0700
Subject: [PATCH] Add TIFFTAG_SAMPLEFORMAT to blocklist

The SAMPLEFORMAT tag is determined by the image format and should not be copied from legacy_ifd.
---
 src/PIL/TiffImagePlugin.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/PIL/TiffImagePlugin.py b/src/PIL/TiffImagePlugin.py
index 835c460a5..cf91211b2 100644
--- a/src/PIL/TiffImagePlugin.py
+++ b/src/PIL/TiffImagePlugin.py
@@ -1540,7 +1540,7 @@ def _save(im, fp, filename):
 
         # STRIPOFFSETS and STRIPBYTECOUNTS are added by the library
         # based on the data in the strip.
-        blocklist = [STRIPOFFSETS, STRIPBYTECOUNTS]
+        blocklist = [STRIPOFFSETS, STRIPBYTECOUNTS, SAMPLEFORMAT]
         atts = {}
         # bits per sample is a single short in the tiff directory, not a list.
         atts[BITSPERSAMPLE] = bits[0]