diff --git a/src/ImageSharp/Colors/PackedPixel/BulkPixelOperations.cs b/src/ImageSharp/Colors/PackedPixel/BulkPixelOperations.cs
index c1f6001af..ffa28fc13 100644
--- a/src/ImageSharp/Colors/PackedPixel/BulkPixelOperations.cs
+++ b/src/ImageSharp/Colors/PackedPixel/BulkPixelOperations.cs
@@ -71,7 +71,6 @@
             ArrayPointer<byte> destBytes, int count)
         {
             byte* sp = (byte*)sourceColors;
-
             byte[] dest = destBytes.Array;
 
             for (int i = destBytes.Offset; i < destBytes.Offset + count*3; i+=3)
@@ -81,29 +80,89 @@
                 sp += ColorSize;
             }
         }
-        
-        internal virtual void PackToXyzwBytes(ArrayPointer<TColor> sourceColors, ArrayPointer<byte> destBytes, int count)
-        {
-        }
 
         internal virtual void PackFromXyzwBytes(ArrayPointer<byte> sourceBytes, ArrayPointer<TColor> destColors, int count)
         {
+            byte* sp = (byte*)sourceBytes;
+            byte* dp = (byte*)destColors.PointerAtOffset;
+
+            for (int i = 0; i < count; i++)
+            {
+                TColor c = default(TColor);
+                c.PackFromBytes(sp[0], sp[1], sp[2], sp[3]);
+                Unsafe.Write(dp, c);
+                sp += 4;
+                dp += ColorSize;
+            }
         }
-        
-        internal virtual void PackToZyxBytes(ArrayPointer<TColor> sourceColors, ArrayPointer<byte> destBytes, int count)
+
+        internal virtual void PackToXyzwBytes(ArrayPointer<TColor> sourceColors, ArrayPointer<byte> destBytes, int count)
         {
+            byte* sp = (byte*)sourceColors;
+            byte[] dest = destBytes.Array;
+
+            for (int i = destBytes.Offset; i < destBytes.Offset + count * 4; i += 4)
+            {
+                TColor c = Unsafe.Read<TColor>(sp);
+                c.ToXyzwBytes(dest, i);
+                sp += ColorSize;
+            }
         }
 
         internal virtual void PackFromZyxBytes(ArrayPointer<byte> sourceBytes, ArrayPointer<TColor> destColors, int count)
         {
+            byte* sp = (byte*)sourceBytes;
+            byte* dp = (byte*)destColors.PointerAtOffset;
+
+            for (int i = 0; i < count; i++)
+            {
+                TColor c = default(TColor);
+                c.PackFromBytes(sp[2], sp[1], sp[0], 255);
+                Unsafe.Write(dp, c);
+                sp += 3;
+                dp += ColorSize;
+            }
         }
 
-        internal virtual void PackToZyxwBytes(ArrayPointer<TColor> sourceColors, ArrayPointer<byte> destBytes, int count)
+        internal virtual void PackToZyxBytes(ArrayPointer<TColor> sourceColors, ArrayPointer<byte> destBytes, int count)
         {
+            byte* sp = (byte*)sourceColors;
+            byte[] dest = destBytes.Array;
+
+            for (int i = destBytes.Offset; i < destBytes.Offset + count * 3; i += 3)
+            {
+                TColor c = Unsafe.Read<TColor>(sp);
+                c.ToZyxBytes(dest, i);
+                sp += ColorSize;
+            }
         }
 
         internal virtual void PackFromZyxwBytes(ArrayPointer<byte> sourceBytes, ArrayPointer<TColor> destColors, int count)
         {
+            byte* sp = (byte*)sourceBytes;
+            byte* dp = (byte*)destColors.PointerAtOffset;
+
+            for (int i = 0; i < count; i++)
+            {
+                TColor c = default(TColor);
+                c.PackFromBytes(sp[2], sp[1], sp[0], sp[3]);
+                Unsafe.Write(dp, c);
+                sp += 4;
+                dp += ColorSize;
+            }
+        }
+
+        internal virtual void PackToZyxwBytes(ArrayPointer<TColor> sourceColors, ArrayPointer<byte> destBytes, int count)
+        {
+            byte* sp = (byte*)sourceColors;
+            byte[] dest = destBytes.Array;
+
+            for (int i = destBytes.Offset; i < destBytes.Offset + count * 4; i += 4)
+            {
+                TColor c = Unsafe.Read<TColor>(sp);
+                c.ToZyxwBytes(dest, i);
+                sp += ColorSize;
+            }
         }
     }
 }
\ No newline at end of file
diff --git a/tests/ImageSharp.Tests/Colors/BulkPixelOperationsTests.cs b/tests/ImageSharp.Tests/Colors/BulkPixelOperationsTests.cs
index 472582310..3682aa78a 100644
--- a/tests/ImageSharp.Tests/Colors/BulkPixelOperationsTests.cs
+++ b/tests/ImageSharp.Tests/Colors/BulkPixelOperationsTests.cs
@@ -21,7 +21,7 @@
     public abstract class BulkPixelOperationsTests<TColor>
         where TColor : struct, IPixel<TColor>
     {
-        public static TheoryData<int> ArraySizesData = new TheoryData<int> { 7, 16, 1111 };
+        protected static TheoryData<int> ArraySizesData = new TheoryData<int> { 7, 16, 1111 };
         
         [Theory]
         [MemberData(nameof(ArraySizesData))]
@@ -103,48 +103,129 @@
                 );
         }
 
-
         [Theory]
         [MemberData(nameof(ArraySizesData))]
-        public void PackToXyzwBytes(int count)
+        public void PackFromXyzwBytes(int count)
         {
-            throw new NotImplementedException();
+            byte[] source = CreateByteTestData(count * 4);
+            TColor[] expected = new TColor[count];
+
+            for (int i = 0; i < count; i++)
+            {
+                int i4 = i * 4;
+
+                expected[i].PackFromBytes(source[i4 + 0], source[i4 + 1], source[i4 + 2], source[i4 + 3]);
+            }
+
+            TestOperation(
+                source,
+                expected,
+                (ops, s, d) => ops.PackFromXyzwBytes(s, d, count)
+                );
         }
 
         [Theory]
         [MemberData(nameof(ArraySizesData))]
-        public void PackFromXyzwBytes(int count)
+        public void PackToXyzwBytes(int count)
         {
-            throw new NotImplementedException();
+            TColor[] source = CreatePixelTestData(count);
+            byte[] expected = new byte[count * 4];
+
+            for (int i = 0; i < count; i++)
+            {
+                int i4 = i * 4;
+                source[i].ToXyzwBytes(expected, i4);
+            }
+
+            TestOperation(
+                source,
+                expected,
+                (ops, s, d) => ops.PackToXyzwBytes(s, d, count)
+                );
         }
 
         [Theory]
         [MemberData(nameof(ArraySizesData))]
-        public void PackToZyxBytes(int count)
+        public void PackFromZyxBytes(int count)
         {
-            throw new NotImplementedException();
+            byte[] source = CreateByteTestData(count * 3);
+            TColor[] expected = new TColor[count];
+
+            for (int i = 0; i < count; i++)
+            {
+                int i3 = i * 3;
+
+                expected[i].PackFromBytes(source[i3 + 2], source[i3 + 1], source[i3 + 0], 255);
+            }
+
+            TestOperation(
+                source,
+                expected,
+                (ops, s, d) => ops.PackFromZyxBytes(s, d, count)
+                );
         }
 
         [Theory]
         [MemberData(nameof(ArraySizesData))]
-        public void PackFromZyxBytes(int count)
+        public void PackToZyxBytes(int count)
         {
-            throw new NotImplementedException();
+            TColor[] source = CreatePixelTestData(count);
+            byte[] expected = new byte[count * 3];
+
+            for (int i = 0; i < count; i++)
+            {
+                int i3 = i * 3;
+                source[i].ToZyxBytes(expected, i3);
+            }
+
+            TestOperation(
+                source,
+                expected,
+                (ops, s, d) => ops.PackToZyxBytes(s, d, count)
+                );
         }
 
         [Theory]
         [MemberData(nameof(ArraySizesData))]
-        public void PackToZyxwBytes(int count)
+        public void PackFromZyxwBytes(int count)
         {
-            throw new NotImplementedException();
+            byte[] source = CreateByteTestData(count * 4);
+            TColor[] expected = new TColor[count];
+
+            for (int i = 0; i < count; i++)
+            {
+                int i4 = i * 4;
+
+                expected[i].PackFromBytes(source[i4 + 2], source[i4 + 1], source[i4 + 0], source[i4 + 3]);
+            }
+
+            TestOperation(
+                source,
+                expected,
+                (ops, s, d) => ops.PackFromZyxwBytes(s, d, count)
+                );
         }
 
         [Theory]
         [MemberData(nameof(ArraySizesData))]
-        public void PackFromZyxwBytes(int count)
+        public void PackToZyxwBytes(int count)
         {
-            throw new NotImplementedException();
+            TColor[] source = CreatePixelTestData(count);
+            byte[] expected = new byte[count * 4];
+
+            for (int i = 0; i < count; i++)
+            {
+                int i4 = i * 4;
+                source[i].ToZyxwBytes(expected, i4);
+            }
+
+            TestOperation(
+                source,
+                expected,
+                (ops, s, d) => ops.PackToZyxwBytes(s, d, count)
+                );
         }
+
         
         private class TestBuffers<TSource, TDest> : IDisposable
             where TSource : struct