Adjust percentages for ARM (visually checked)

tests/ImageSharp.Tests/Formats/Gif/GifDecoderTests.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
+using System.Runtime.InteropServices;
 using Microsoft.DotNet.RemoteExecutor;
 using SixLabors.ImageSharp.Formats;
 using SixLabors.ImageSharp.Formats.Gif;
@@ -50,7 +51,7 @@ public class GifDecoderTests
 
         image.DebugSave(provider, testOutputDetails: details, appendPixelTypeToFileName: false);
         image.CompareToReferenceOutput(
-            ImageComparer.TolerantPercentage(0.0001F),
+            ImageComparer.TolerantPercentage(TestEnvironment.OSArchitecture == Architecture.Arm64 ? 0.0002F : 0.0001F),
             provider,
             testOutputDetails: details,
             appendPixelTypeToFileName: false);

tests/ImageSharp.Tests/Formats/Tga/TgaDecoderTests.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
+using System.Runtime.InteropServices;
 using Microsoft.DotNet.RemoteExecutor;
 using SixLabors.ImageSharp.Formats;
 using SixLabors.ImageSharp.Formats.Tga;
@@ -759,7 +760,7 @@ public class TgaDecoderTests
 
         image.DebugSave(provider, testOutputDetails: details, appendPixelTypeToFileName: false);
         image.CompareToReferenceOutput(
-            ImageComparer.TolerantPercentage(0.0001F),
+            ImageComparer.TolerantPercentage(TestEnvironment.OSArchitecture == Architecture.Arm64 ? 0.00017F : 0.0001F),
             provider,
             testOutputDetails: details,
             appendPixelTypeToFileName: false);

tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs

@@ -2,6 +2,7 @@
 // Licensed under the Six Labors Split License.
 
 // ReSharper disable InconsistentNaming
+using System.Runtime.InteropServices;
 using SixLabors.ImageSharp.Formats;
 using SixLabors.ImageSharp.Formats.Tiff;
 using SixLabors.ImageSharp.Metadata;
@@ -766,7 +767,7 @@ public class TiffDecoderTests : TiffDecoderBaseTester
 
         image.DebugSave(provider, testOutputDetails: details, appendPixelTypeToFileName: false);
         image.CompareToReferenceOutput(
-            ImageComparer.Exact,
+            TestEnvironment.OSArchitecture == Architecture.Arm64 ? ImageComparer.TolerantPercentage(0.0006F) : ImageComparer.Exact,
             provider,
             testOutputDetails: details,
             appendPixelTypeToFileName: false);

tests/ImageSharp.Tests/Formats/WebP/WebpDecoderTests.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
+using System.Runtime.InteropServices;
 using SixLabors.ImageSharp.Formats;
 using SixLabors.ImageSharp.Formats.Webp;
 using SixLabors.ImageSharp.PixelFormats;
@@ -366,7 +367,7 @@ public class WebpDecoderTests
 
         image.DebugSave(provider, testOutputDetails: details, appendPixelTypeToFileName: false);
         image.CompareToReferenceOutput(
-            ImageComparer.TolerantPercentage(0.0007F),
+            ImageComparer.TolerantPercentage(TestEnvironment.OSArchitecture == Architecture.Arm64 ? 0.0156F : 0.0007F),
             provider,
             testOutputDetails: details,
             appendPixelTypeToFileName: false);

tests/ImageSharp.Tests/TestUtilities/ImageComparison/Exceptions/ImageDifferenceIsOverThresholdException.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Six Labors.
 // Licensed under the Six Labors Split License.
 
+using System.Globalization;
 using System.Text;
 
 namespace SixLabors.ImageSharp.Tests.TestUtilities.ImageComparison;
@@ -11,33 +12,36 @@ public class ImageDifferenceIsOverThresholdException : ImagesSimilarityException
 
     public ImageDifferenceIsOverThresholdException(IEnumerable<ImageSimilarityReport> reports)
         : base("Image difference is over threshold!" + StringifyReports(reports))
-    {
-        this.Reports = reports.ToArray();
-    }
+        => this.Reports = reports.ToArray();
 
     private static string StringifyReports(IEnumerable<ImageSimilarityReport> reports)
     {
-        var sb = new StringBuilder();
+        StringBuilder sb = new();
+
+        sb.Append(Environment.NewLine);
+        sb.AppendFormat(CultureInfo.InvariantCulture, "Test Environment OS : {0}", GetEnvironmentName());
+        sb.Append(Environment.NewLine);
 
+        sb.AppendFormat(CultureInfo.InvariantCulture, "Test Environment is CI : {0}", TestEnvironment.RunsOnCI);
         sb.Append(Environment.NewLine);
 
-        sb.AppendFormat("Test Environment OS : {0}", GetEnvironmentName());
+        sb.AppendFormat(CultureInfo.InvariantCulture, "Test Environment is .NET Core : {0}", !TestEnvironment.IsFramework);
         sb.Append(Environment.NewLine);
 
-        sb.AppendFormat("Test Environment is CI : {0}", TestEnvironment.RunsOnCI);
+        sb.AppendFormat(CultureInfo.InvariantCulture, "Test Environment is Mono : {0}", TestEnvironment.IsMono);
         sb.Append(Environment.NewLine);
 
-        sb.AppendFormat("Test Environment is .NET Core : {0}", !TestEnvironment.IsFramework);
+        sb.AppendFormat(CultureInfo.InvariantCulture, "Test Environment OS Architecture : {0}", TestEnvironment.OSArchitecture);
         sb.Append(Environment.NewLine);
 
-        sb.AppendFormat("Test Environment is Mono : {0}", TestEnvironment.IsMono);
+        sb.AppendFormat(CultureInfo.InvariantCulture, "Test Environment Process Architecture : {0}", TestEnvironment.ProcessArchitecture);
         sb.Append(Environment.NewLine);
 
         foreach (ImageSimilarityReport r in reports)
         {
-            sb.AppendFormat("Report ImageFrame {0}: ", r.Index);
-            sb.Append(r);
-            sb.Append(Environment.NewLine);
+            sb.AppendFormat(CultureInfo.InvariantCulture, "Report ImageFrame {0}: ", r.Index)
+              .Append(r)
+              .Append(Environment.NewLine);
         }
 
         return sb.ToString();