Added an extra constructor to image that accepts a byte array.

src/ImageSharp/Image.cs

@@ -45,6 +45,18 @@ namespace ImageSharp
         {
         }
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Image"/> class.
+        /// </summary>
+        /// <param name="bytes">
+        /// The byte array containing image information.
+        /// </param>
+        /// <exception cref="System.ArgumentNullException">Thrown if the <paramref name="bytes"/> is null.</exception>
+        public Image(byte[] bytes)
+            : base(bytes)
+        {
+        }
+
         /// <summary>
         /// Initializes a new instance of the <see cref="Image"/> class
         /// by making a copy from another image.

src/ImageSharp/Image/Image.cs

@@ -72,6 +72,23 @@ namespace ImageSharp
             this.Load(stream);
         }
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Image{TColor, TPacked}"/> class.
+        /// </summary>
+        /// <param name="bytes">
+        /// The byte array containing image information.
+        /// </param>
+        /// <exception cref="System.ArgumentNullException">Thrown if the <paramref name="bytes"/> is null.</exception>
+        public Image(byte[] bytes)
+        {
+            Guard.NotNull(bytes, nameof(bytes));
+
+            using (MemoryStream stream = new MemoryStream(bytes, false))
+            {
+                this.Load(stream);
+            }
+        }
+
         /// <summary>
         /// Initializes a new instance of the <see cref="Image{TColor, TPacked}"/> class
         /// by making a copy from another image.

tests/ImageSharp.Tests/Image/ImageTests.cs

@@ -0,0 +1,32 @@
+// <copyright file="PixelAccessorTests.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Tests
+{
+  using System;
+
+  using Xunit;
+
+  /// <summary>
+  /// Tests the <see cref="Image{TPacked,TPixel}"/> class.
+  /// </summary>
+  public class ImageTests
+  {
+    [Fact]
+    public void ConstructorByteArray()
+    {
+      Assert.Throws<ArgumentNullException>(() =>
+      {
+        new Image((byte[])null);
+      });
+
+      TestFile file = TestImages.Bmp.Car;
+      var image = new Image<Color, uint>(file.Bytes);
+
+      Assert.Equal(600, image.Width);
+      Assert.Equal(450, image.Height);
+    }
+  }
+}

tests/ImageSharp.Tests/TestFile.cs

@@ -16,12 +16,12 @@ namespace ImageSharp.Tests
         {
             this.file = file;
 
-            using (FileStream stream = File.OpenRead(file))
-            {
-                this.image = new Image(stream);
-            }
+            this.Bytes = File.ReadAllBytes(file);
+            this.image = new Image(this.Bytes);
         }
 
+        public byte[] Bytes { get; }
+
         public string FileName
         {
             get