Added optimized ImageFrame implementation.

src/ImageSharp/Image.cs

@@ -61,5 +61,11 @@ namespace ImageSharp
         {
             return new PixelAccessor(this);
         }
+
+        /// <inheritdoc />
+        internal override ImageFrame<Color, uint> ToFrame()
+        {
+            return new ImageFrame(this);
+        }
     }
 }

src/ImageSharp/ImageFrame.cs

@@ -0,0 +1,46 @@
+// <copyright file="Image.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp
+{
+    using System.Diagnostics;
+
+    /// <summary>
+    /// An optimized frame for the <see cref="Image"/> class.
+    /// </summary>
+    [DebuggerDisplay("ImageFrame: {Width}x{Height}")]
+    public class ImageFrame : ImageFrame<Color, uint>
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ImageFrame"/> class.
+        /// </summary>
+        public ImageFrame()
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ImageFrame"/> class.
+        /// </summary>
+        /// <param name="image">
+        /// The image to create the frame from.
+        /// </param>
+        public ImageFrame(ImageBase<Color, uint> image)
+            : base(image)
+        {
+        }
+
+        /// <inheritdoc />
+        public override PixelAccessor<Color, uint> Lock()
+        {
+            return new PixelAccessor(this);
+        }
+
+        /// <inheritdoc />
+        internal override ImageFrame<Color, uint> ToFrame()
+        {
+            return new ImageFrame(this);
+        }
+    }
+}