From e9fddd0a48b2a9367c8c40d2a2b57ab1c08d7852 Mon Sep 17 00:00:00 2001
From: Dmitry Pentin <riotbr3aker@gmail.com>
Date: Wed, 21 Jul 2021 00:27:31 +0300
Subject: [PATCH] Fixed subsample assignment in the encoder

---
 src/ImageSharp/Formats/Jpeg/JpegEncoderCore.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/ImageSharp/Formats/Jpeg/JpegEncoderCore.cs b/src/ImageSharp/Formats/Jpeg/JpegEncoderCore.cs
index bc3a5f1b56..9c66cfe0c3 100644
--- a/src/ImageSharp/Formats/Jpeg/JpegEncoderCore.cs
+++ b/src/ImageSharp/Formats/Jpeg/JpegEncoderCore.cs
@@ -679,7 +679,10 @@ namespace SixLabors.ImageSharp.Formats.Jpeg
                     chrominanceQuantTable = metadata.ChromaQuantizationTable;
                 }
 
-                this.subsample = chromaQuality >= 91 ? JpegSubsample.Ratio444 : JpegSubsample.Ratio420;
+                if (!this.subsample.HasValue)
+                {
+                    this.subsample = chromaQuality >= 91 ? JpegSubsample.Ratio444 : JpegSubsample.Ratio420;
+                }
             }
         }
     }