From 9710f02cf9fe7e2f9f650ae0827b2deef9593b9c Mon Sep 17 00:00:00 2001
From: James Jackson-South <james_south@hotmail.com>
Date: Thu, 13 Apr 2017 13:15:16 +1000
Subject: [PATCH] Png uses Wu by default to ensure full alpha range

---
 src/ImageSharp/Formats/Png/PngEncoderCore.cs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/ImageSharp/Formats/Png/PngEncoderCore.cs b/src/ImageSharp/Formats/Png/PngEncoderCore.cs
index 469c459fb..c11fc94df 100644
--- a/src/ImageSharp/Formats/Png/PngEncoderCore.cs
+++ b/src/ImageSharp/Formats/Png/PngEncoderCore.cs
@@ -7,7 +7,6 @@ namespace ImageSharp.Formats
 {
     using System;
     using System.Buffers;
-    using System.Collections.Generic;
     using System.IO;
     using System.Linq;
 
@@ -487,7 +486,7 @@ namespace ImageSharp.Formats
 
             if (this.quantizer == null)
             {
-                this.quantizer = new OctreeQuantizer<TColor>();
+                this.quantizer = new WuQuantizer<TColor>();
             }
 
             // Quantize the image returning a palette. This boxing is icky.