From 7068ca1349228991a502402e22da4b53b7f63c65 Mon Sep 17 00:00:00 2001
From: Brian Popow <popow@gmx.de>
Date: Wed, 3 Feb 2021 13:02:55 +0100
Subject: [PATCH] Treat IPTC Undefined data type as byte array

---
 src/ImageSharp/Formats/Tiff/TiffDecoderMetadataCreator.cs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/ImageSharp/Formats/Tiff/TiffDecoderMetadataCreator.cs b/src/ImageSharp/Formats/Tiff/TiffDecoderMetadataCreator.cs
index 96149cba80..3cd67d2ab0 100644
--- a/src/ImageSharp/Formats/Tiff/TiffDecoderMetadataCreator.cs
+++ b/src/ImageSharp/Formats/Tiff/TiffDecoderMetadataCreator.cs
@@ -86,12 +86,14 @@ namespace SixLabors.ImageSharp.Formats.Experimental.Tiff
 
             if (iptc != null)
             {
-                if (iptc.DataType == ExifDataType.Byte)
+                if (iptc.DataType == ExifDataType.Byte || iptc.DataType == ExifDataType.Undefined)
                 {
                     iptcBytes = (byte[])iptc.GetValue();
                     return true;
                 }
-                else if (iptc.DataType == ExifDataType.Long)
+
+                // Some Encoders write the data type of IPTC as long.
+                if (iptc.DataType == ExifDataType.Long)
                 {
                     var iptcValues = (uint[])iptc.GetValue();
                     iptcBytes = new byte[iptcValues.Length * 4];