Fixed scalar YccK conversion

src/ImageSharp/Formats/Jpeg/Components/ColorConverters/JpegColorConverter.YccKScalar.cs

@@ -47,9 +47,9 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
                     // r = y + (1.402F * cr);
                     // g = y - (0.344136F * cb) - (0.714136F * cr);
                     // b = y + (1.772F * cb);
-                    c0[i] = MathF.Round(y + (RCrMult * cr), MidpointRounding.AwayFromZero) * scaledK;
-                    c1[i] = MathF.Round(y - (GCbMult * cb) - (GCrMult * cr), MidpointRounding.AwayFromZero) * scaledK;
-                    c2[i] = MathF.Round(y + (BCbMult * cb), MidpointRounding.AwayFromZero) * scaledK;
+                    c0[i] = (maxValue - MathF.Round(y + (RCrMult * cr), MidpointRounding.AwayFromZero)) * scaledK;
+                    c1[i] = (maxValue - MathF.Round(y - (GCbMult * cb) - (GCrMult * cr), MidpointRounding.AwayFromZero)) * scaledK;
+                    c2[i] = (maxValue - MathF.Round(y + (BCbMult * cb), MidpointRounding.AwayFromZero)) * scaledK;
                 }
             }
 

src/ImageSharp/Formats/Jpeg/Components/ColorConverters/JpegColorConverter.YccKVector.cs

@@ -71,8 +71,8 @@ namespace SixLabors.ImageSharp.Formats.Jpeg.Components
             }
 
             /// <inheritdoc/>
-            protected override void ConvertToRgbInplaceScalarRemainder(in ComponentValues values) =>
-                YccKScalar.ConvertToRgpInplace(values, this.MaximumValue, this.HalfValue);
+            protected override void ConvertToRgbInplaceScalarRemainder(in ComponentValues values)
+                => YccKScalar.ConvertToRgpInplace(values, this.MaximumValue, this.HalfValue);
 
             /// <inheritdoc/>
             protected override void ConvertFromRgbVectorized(in ComponentValues values, Span<float> rLane, Span<float> gLane, Span<float> bLane)