Added images to quality estimation tests

tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.Metadata.cs

@@ -55,7 +55,9 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
         {
             { TestImages.Jpeg.Baseline.Calliphora, 80 },
             { TestImages.Jpeg.Progressive.Fb, 75 },
-            { TestImages.Jpeg.Issues.IncorrectQuality845, 98 }
+            { TestImages.Jpeg.Issues.IncorrectQuality845, 98 },
+            { TestImages.Jpeg.Baseline.ForestBridgeDifferentComponentsQuality, 89 },
+            { TestImages.Jpeg.Progressive.Winter, 80 }
         };
 
         [Theory]

tests/ImageSharp.Tests/TestImages.cs

@@ -157,6 +157,7 @@ namespace SixLabors.ImageSharp.Tests
                 public const string Fb = "Jpg/progressive/fb.jpg";
                 public const string Progress = "Jpg/progressive/progress.jpg";
                 public const string Festzug = "Jpg/progressive/Festzug.jpg";
+                public const string Winter = "Jpg/progressive/winter.jpg";
 
                 public static class Bad
                 {
@@ -198,6 +199,7 @@ namespace SixLabors.ImageSharp.Tests
                 public const string Iptc = "Jpg/baseline/iptc.jpg";
                 public const string App13WithEmptyIptc = "Jpg/baseline/iptc-psAPP13-wIPTCempty.jpg";
                 public const string HistogramEqImage = "Jpg/baseline/640px-Unequalized_Hawkes_Bay_NZ.jpg";
+                public const string ForestBridgeDifferentComponentsQuality = "Jpg/baseline/forest_bridge.jpg";
 
                 public static readonly string[] All =
                 {

tests/Images/Input/Jpg/baseline/forest_bridge.jpg

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:56b3db3d0e146ee7fe27f8fbda4bccc1483e18104bfc747cac75a2ec03d65647
+size 1936782

tests/Images/Input/Jpg/progressive/winter.jpg

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d377b70cedfb9d25f1ae0244dcf2edb000540aa4a8925cce57f810f7efd0dc84
+size 234976