From 28c4e2c93e9099f66831be0bc168cd2c9dc9f39c Mon Sep 17 00:00:00 2001
From: Anton Firszov <antonfir@gmail.com>
Date: Mon, 19 Feb 2018 01:00:44 +0100
Subject: [PATCH] use ImageComparer.Tolerant() when testing Palette PNG
 encoding

---
 tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs b/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs
index ef261aac9..7e24f41df 100644
--- a/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs
@@ -19,6 +19,8 @@ namespace SixLabors.ImageSharp.Tests
 
     public class PngEncoderTests : FileTestBase
     {
+        private const float ToleranceThresholdForPaletteEncoder = 0.01f / 100;
+
         /// <summary>
         /// All types except Palette
         /// </summary>
@@ -123,7 +125,7 @@ namespace SixLabors.ImageSharp.Tests
             
                 using (var encodedImage = Image.Load<TPixel>(referenceOutputFile, referenceDecoder))
                 {
-                    ImageComparer comparer = null ?? ImageComparer.Exact;
+                    ImageComparer comparer = pngColorType== PngColorType.Palette ? ImageComparer.Tolerant(ToleranceThresholdForPaletteEncoder) : ImageComparer.Exact;
                     comparer.CompareImagesOrFrames(image, encodedImage);
                 }
             }