From b04b9f4c7f163df99cb1bd3203e4beb9d1c68487 Mon Sep 17 00:00:00 2001
From: Brian Popow <popow@gmx.de>
Date: Mon, 30 Nov 2020 18:32:21 +0100
Subject: [PATCH] Fix issue with packed bits and bi color tiffs

---
 src/ImageSharp/Formats/Tiff/README.md           | 2 +-
 src/ImageSharp/Formats/Tiff/Utils/TiffWriter.cs | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/ImageSharp/Formats/Tiff/README.md b/src/ImageSharp/Formats/Tiff/README.md
index 6cfda9df95..a87813a23d 100644
--- a/src/ImageSharp/Formats/Tiff/README.md
+++ b/src/ImageSharp/Formats/Tiff/README.md
@@ -42,7 +42,7 @@
 |---------------------------|:-----:|:-----:|--------------------------|
 |None                       |   Y   |   Y   |                          |
 |Ccitt1D                    |   Y   |   Y   |                          |
-|PackBits                   |       |   Y   |                          |
+|PackBits                   |   Y   |   Y   |                          |
 |CcittGroup3Fax             |   Y   |   Y   |                          |
 |CcittGroup4Fax             |       |       |                          |
 |Lzw                        |       |   Y   | Based on ImageSharp GIF LZW implementation - this code could be modified to be (i) shared, or (ii) optimised for each case |
diff --git a/src/ImageSharp/Formats/Tiff/Utils/TiffWriter.cs b/src/ImageSharp/Formats/Tiff/Utils/TiffWriter.cs
index f57f056451..ea8a9d5909 100644
--- a/src/ImageSharp/Formats/Tiff/Utils/TiffWriter.cs
+++ b/src/ImageSharp/Formats/Tiff/Utils/TiffWriter.cs
@@ -591,7 +591,7 @@ namespace SixLabors.ImageSharp.Formats.Tiff.Utils
                 }
 
                 var size = PackBitsWriter.PackBits(outputRow, compressedRowSpan);
-                this.output.Write(compressedRowSpan);
+                this.output.Write(compressedRowSpan.Slice(0, size));
                 bytesWritten += size;
 
                 outputRow.Clear();