build fix

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

@@ -49,7 +49,7 @@ namespace SixLabors.ImageSharp.Tests
 
         // BUG: PDF.js output is wrong on spectral level!
         private static readonly ImageComparer PdfJsProgressiveComparer =
-            ImageComparer.Tolerant(0.015f, pixelThresholdHammingDistance: 4);
+            ImageComparer.Tolerant(0.015f, perPixelManhattanThreshold: 4);
 
 
         public JpegDecoderTests(ITestOutputHelper output)

tests/ImageSharp.Tests/Formats/Jpg/SpectralJpegTests.cs

@@ -6,6 +6,7 @@ namespace SixLabors.ImageSharp.Tests
     using System.Linq;
 
     using SixLabors.ImageSharp.Formats;
+    using SixLabors.ImageSharp.Formats.Jpeg;
     using SixLabors.ImageSharp.Formats.Jpeg.PdfJsPort;
     using SixLabors.ImageSharp.PixelFormats;
     using SixLabors.ImageSharp.Tests.TestUtilities.ImageComparison;

tests/ImageSharp.Tests/TestUtilities/Tests/ReferenceCodecTests.cs

@@ -1,6 +1,7 @@
 namespace SixLabors.ImageSharp.Tests
 {
     using SixLabors.ImageSharp.Formats;
+    using SixLabors.ImageSharp.Formats.Png;
     using SixLabors.ImageSharp.PixelFormats;
     using SixLabors.ImageSharp.Tests.TestUtilities.ImageComparison;
     using SixLabors.ImageSharp.Tests.TestUtilities.ReferenceCodecs;