diff --git a/src/ImageProcessor/Colors/Color.cs b/src/ImageProcessor/Colors/Color.cs
index 1ffda3c46..d85464471 100644
--- a/src/ImageProcessor/Colors/Color.cs
+++ b/src/ImageProcessor/Colors/Color.cs
@@ -111,11 +111,34 @@ namespace ImageProcessor
         /// <param name="vector">
         /// The vector.
         /// </param>
-        private Color(Vector4 vector)
+        public Color(Vector4 vector)
         {
             this.backingVector = vector;
         }
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Color"/> struct.
+        /// </summary>
+        /// <param name="vector">
+        /// The vector representing the red, green, and blue componenets.
+        /// </param>
+        public Color(Vector3 vector)
+        {
+            this.backingVector = new Vector4(vector.X, vector.Y, vector.Z, 1);
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Color"/> struct.
+        /// </summary>
+        /// <param name="vector">
+        /// The vector representing the red, green, and blue componenets.
+        /// </param>
+        /// <param name="alpha">The alpha component.</param>
+        public Color(Vector3 vector, float alpha)
+        {
+            this.backingVector = new Vector4(vector.X, vector.Y, vector.Z, alpha);
+        }
+
         /// <summary>
         /// Gets or sets the red component of the color.
         /// </summary>
@@ -450,6 +473,24 @@ namespace ImageProcessor
             return (from * (1 - amount)) + (to * amount);
         }
 
+        /// <summary>
+        /// Gets a <see cref="Vector4"/> representation for this <see cref="Color"/>.
+        /// </summary>
+        /// <returns>A <see cref="Vector4"/> representation for this object.</returns>
+        public Vector4 ToVector4()
+        {
+            return new Vector4(this.R, this.G, this.B, this.A);
+        }
+
+        /// <summary>
+        /// Gets a <see cref="Vector3"/> representation for this <see cref="Color"/>.
+        /// </summary>
+        /// <returns>A <see cref="Vector3"/> representation for this object.</returns>
+        public Vector3 ToVector3()
+        {
+            return new Vector3(this.R, this.G, this.B);
+        }
+
         /// <inheritdoc/>
         public override bool Equals(object obj)
         {
diff --git a/src/ImageProcessor/Filters/Alpha.cs b/src/ImageProcessor/Filters/Alpha.cs
index 02c7ff364..4f2e01f70 100644
--- a/src/ImageProcessor/Filters/Alpha.cs
+++ b/src/ImageProcessor/Filters/Alpha.cs
@@ -34,7 +34,7 @@ namespace ImageProcessor.Filters
         /// <inheritdoc/>
         protected override void Apply(ImageBase target, ImageBase source, Rectangle targetRectangle, Rectangle sourceRectangle, int startY, int endY)
         {
-            double alpha = this.Value / 100.0;
+            float alpha = this.Value / 100f;
             int sourceY = sourceRectangle.Y;
             int sourceBottom = sourceRectangle.Bottom;
             int startX = sourceRectangle.X;
@@ -49,9 +49,9 @@ namespace ImageProcessor.Filters
                         {
                             for (int x = startX; x < endX; x++)
                             {
-                                Bgra32 color = source[x, y];
-                                double a = color.A * alpha;
-                                target[x, y] = new Bgra32(color.B, color.G, color.R, a.ToByte());
+                                Color color = source[x, y];
+                                color.A = color.A * alpha;
+                                target[x, y] = color;
                             }
                         }
                     });
diff --git a/src/ImageProcessor/Filters/ColorMatrix/ColorMatrixFilter.cs b/src/ImageProcessor/Filters/ColorMatrix/ColorMatrixFilter.cs
index 68f929be6..17a49b8fb 100644
--- a/src/ImageProcessor/Filters/ColorMatrix/ColorMatrixFilter.cs
+++ b/src/ImageProcessor/Filters/ColorMatrix/ColorMatrixFilter.cs
@@ -36,13 +36,12 @@ namespace ImageProcessor.Filters
         /// <inheritdoc/>
         protected override void Apply(ImageBase target, ImageBase source, Rectangle targetRectangle, Rectangle sourceRectangle, int startY, int endY)
         {
+            bool gamma = this.GammaAdjust;
             int sourceY = sourceRectangle.Y;
             int sourceBottom = sourceRectangle.Bottom;
             int startX = sourceRectangle.X;
             int endX = sourceRectangle.Right;
             ColorMatrix matrix = this.Value;
-            Bgra32 previousColor = source[0, 0];
-            Bgra32 pixelValue = this.ApplyMatrix(previousColor, matrix);
 
             Parallel.For(
                 startY,
@@ -53,20 +52,7 @@ namespace ImageProcessor.Filters
                         {
                             for (int x = startX; x < endX; x++)
                             {
-                                Bgra32 sourceColor = source[x, y];
-
-                                // Check if this is the same as the last pixel. If so use that value
-                                // rather than calculating it again. This is an inexpensive optimization.
-                                if (sourceColor != previousColor)
-                                {
-                                    // Perform the operation on the pixel.
-                                    pixelValue = this.ApplyMatrix(sourceColor, matrix);
-
-                                    // And setup the previous pointer
-                                    previousColor = sourceColor;
-                                }
-
-                                target[x, y] = pixelValue;
+                                target[x, y] = ApplyMatrix(source[x, y], matrix, gamma);
                             }
                         }
                     });
@@ -75,33 +61,31 @@ namespace ImageProcessor.Filters
         /// <summary>
         /// Applies the color matrix against the given color.
         /// </summary>
-        /// <param name="sourceColor">The source color.</param>
+        /// <param name="color">The source color.</param>
         /// <param name="matrix">The matrix.</param>
+        /// <param name="gamma">Whether to perform gamma adjustments.</param>
         /// <returns>
-        /// The <see cref="Bgra32"/>.
+        /// The <see cref="Color"/>.
         /// </returns>
-        private Bgra32 ApplyMatrix(Bgra32 sourceColor, ColorMatrix matrix)
+        private static Color ApplyMatrix(Color color, ColorMatrix matrix, bool gamma)
         {
-            bool gamma = this.GammaAdjust;
-
             if (gamma)
             {
-                sourceColor = PixelOperations.ToLinear(sourceColor);
+                color = PixelOperations.ToLinear(color);
             }
 
-            int sr = sourceColor.R;
-            int sg = sourceColor.G;
-            int sb = sourceColor.B;
-            int sa = sourceColor.A;
+            float sr = color.R;
+            float sg = color.G;
+            float sb = color.B;
+            float sa = color.A;
 
             // TODO: Investigate RGBAW
-            byte r = ((sr * matrix.Matrix00) + (sg * matrix.Matrix10) + (sb * matrix.Matrix20) + (sa * matrix.Matrix30) + (255f * matrix.Matrix40)).ToByte();
-            byte g = ((sr * matrix.Matrix01) + (sg * matrix.Matrix11) + (sb * matrix.Matrix21) + (sa * matrix.Matrix31) + (255f * matrix.Matrix41)).ToByte();
-            byte b = ((sr * matrix.Matrix02) + (sg * matrix.Matrix12) + (sb * matrix.Matrix22) + (sa * matrix.Matrix32) + (255f * matrix.Matrix42)).ToByte();
-            byte a = ((sr * matrix.Matrix03) + (sg * matrix.Matrix13) + (sb * matrix.Matrix23) + (sa * matrix.Matrix33) + (255f * matrix.Matrix43)).ToByte();
+            color.R = (sr * matrix.Matrix00) + (sg * matrix.Matrix10) + (sb * matrix.Matrix20) + (sa * matrix.Matrix30) + matrix.Matrix40;
+            color.G = (sr * matrix.Matrix01) + (sg * matrix.Matrix11) + (sb * matrix.Matrix21) + (sa * matrix.Matrix31) + matrix.Matrix41;
+            color.B = (sr * matrix.Matrix02) + (sg * matrix.Matrix12) + (sb * matrix.Matrix22) + (sa * matrix.Matrix32) + matrix.Matrix42;
+            color.A = (sr * matrix.Matrix03) + (sg * matrix.Matrix13) + (sb * matrix.Matrix23) + (sa * matrix.Matrix33) + matrix.Matrix43;
 
-            // TODO: Fix this.
-            return gamma ? (Bgra32)PixelOperations.ToSrgb(new Bgra32(b, g, r, a)) : new Bgra32(b, g, r, a);
+            return gamma ? PixelOperations.ToSrgb(color) : color;
         }
     }
 }
diff --git a/src/ImageProcessor/Filters/ColorMatrix/Invert.cs b/src/ImageProcessor/Filters/ColorMatrix/Invert.cs
deleted file mode 100644
index 24c8f52a0..000000000
--- a/src/ImageProcessor/Filters/ColorMatrix/Invert.cs
+++ /dev/null
@@ -1,35 +0,0 @@
-// <copyright file="Invert.cs" company="James South">
-// Copyright © James South and contributors.
-// Licensed under the Apache License, Version 2.0.
-// </copyright>
-
-namespace ImageProcessor.Filters
-{
-    /// <summary>
-    /// Inverts the colors of the image.
-    /// </summary>
-    public class Invert : ColorMatrixFilter
-    {
-        /// <summary>
-        /// The inversion matrix.
-        /// TODO: With gamma adjustment enabled this leaves the image too bright.
-        /// </summary>
-        private static readonly ColorMatrix Matrix = new ColorMatrix(
-            new[]
-                {
-                    new float[] { -1, 0, 0, 0, 0 },
-                    new float[] { 0, -1, 0, 0, 0 },
-                    new float[] { 0, 0, -1, 0, 0 },
-                    new float[] { 0, 0, 0, 1, 0 },
-                    new float[] { 1, 1, 1, 0, 1 }
-                });
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="Invert"/> class.
-        /// </summary>
-        public Invert()
-            : base(Matrix, false)
-        {
-        }
-    }
-}
diff --git a/src/ImageProcessor/Filters/Contrast.cs b/src/ImageProcessor/Filters/Contrast.cs
index 2644b8f72..0986dc3d0 100644
--- a/src/ImageProcessor/Filters/Contrast.cs
+++ b/src/ImageProcessor/Filters/Contrast.cs
@@ -34,7 +34,7 @@ namespace ImageProcessor.Filters
         /// <inheritdoc/>
         protected override void Apply(ImageBase target, ImageBase source, Rectangle targetRectangle, Rectangle sourceRectangle, int startY, int endY)
         {
-            double contrast = (100.0 + this.Value) / 100.0;
+            float contrast = (100f + this.Value) / 100f;
             int sourceY = sourceRectangle.Y;
             int sourceBottom = sourceRectangle.Bottom;
             int startX = sourceRectangle.X;
@@ -49,36 +49,37 @@ namespace ImageProcessor.Filters
                         {
                             for (int x = startX; x < endX; x++)
                             {
-                                Bgra32 sourceColor = source[x, y];
-                                sourceColor = PixelOperations.ToLinear(sourceColor);
+                                target[x, y] = AdjustContrast(source[x, y], contrast);
+                            }
+                        }
+                    });
+        }
 
-                                double r = sourceColor.R / 255.0;
-                                r -= 0.5;
-                                r *= contrast;
-                                r += 0.5;
-                                r *= 255;
-                                r = r.ToByte();
+        /// <summary>
+        /// Returns a <see cref="Color"/> with the contrast adjusted.
+        /// </summary>
+        /// <param name="color">The source color.</param>
+        /// <param name="contrast">The contrast adjustment factor.</param>
+        /// <returns>
+        /// The <see cref="Color"/>.
+        /// </returns>
+        private static Color AdjustContrast(Color color, float contrast)
+        {
+            color = PixelOperations.ToLinear(color);
 
-                                double g = sourceColor.G / 255.0;
-                                g -= 0.5;
-                                g *= contrast;
-                                g += 0.5;
-                                g *= 255;
-                                g = g.ToByte();
+            color.R -= 0.5f;
+            color.R *= contrast;
+            color.R += 0.5f;
 
-                                double b = sourceColor.B / 255.0;
-                                b -= 0.5;
-                                b *= contrast;
-                                b += 0.5;
-                                b *= 255;
-                                b = b.ToByte();
+            color.G -= 0.5f;
+            color.G *= contrast;
+            color.G += 0.5f;
 
-                                Bgra32 destinationColor = new Bgra32(b.ToByte(), g.ToByte(), r.ToByte(), sourceColor.A);
-                                destinationColor = PixelOperations.ToSrgb(destinationColor);
-                                target[x, y] = destinationColor;
-                            }
-                        }
-                    });
+            color.B -= 0.5f;
+            color.B *= contrast;
+            color.B += 0.5f;
+
+            return PixelOperations.ToSrgb(color);
         }
     }
 }
diff --git a/src/ImageProcessor/Filters/Invert.cs b/src/ImageProcessor/Filters/Invert.cs
index ade3c6829..d2fa9445a 100644
--- a/src/ImageProcessor/Filters/Invert.cs
+++ b/src/ImageProcessor/Filters/Invert.cs
@@ -30,9 +30,11 @@ namespace ImageProcessor.Filters
                             for (int x = startX; x < endX; x++)
                             {
                                 // TODO: This doesn't work for gamma test images.
-                                Bgra32 color = source[x, y];
-                                Bgra32 targetColor = new Bgra32((255 - color.B).ToByte(), (255 - color.G).ToByte(), (255 - color.R).ToByte(), color.A);
-                                target[x, y] = targetColor;
+                                Color color = source[x, y];
+                                color.R = 1 - color.R;
+                                color.G = 1 - color.G;
+                                color.B = 1 - color.B;
+                                target[x, y] = color;
                             }
                         }
                     });
diff --git a/src/ImageProcessor/ImageProcessor.csproj b/src/ImageProcessor/ImageProcessor.csproj
index 3e506f65e..48294d14f 100644
--- a/src/ImageProcessor/ImageProcessor.csproj
+++ b/src/ImageProcessor/ImageProcessor.csproj
@@ -40,6 +40,7 @@
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <DocumentationFile>bin\Release\ImageProcessor.XML</DocumentationFile>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="Colors\Formats\Cmyk.cs" />
diff --git a/tests/ImageProcessor.Tests/Processors/Filters/FilterTests.cs b/tests/ImageProcessor.Tests/Processors/Filters/FilterTests.cs
index f364dd3f0..e1fe80d01 100644
--- a/tests/ImageProcessor.Tests/Processors/Filters/FilterTests.cs
+++ b/tests/ImageProcessor.Tests/Processors/Filters/FilterTests.cs
@@ -15,13 +15,13 @@ namespace ImageProcessor.Tests
             //{ "Contrast-50", new Contrast(50) },
             //{ "Contrast--50", new Contrast(-50) },
             //{ "Alpha--50", new Alpha(50) },
-            //{ "Invert", new Invert() },
-            //{ "Sepia", new Sepia() },
-            //{ "BlackWhite", new BlackWhite() },
-            //{ "Lomograph", new Lomograph() },
-            //{ "Polaroid", new Polaroid() },
+            { "Invert", new Invert() },
+            { "Sepia", new Sepia() },
+            { "BlackWhite", new BlackWhite() },
+            { "Lomograph", new Lomograph() },
+            { "Polaroid", new Polaroid() },
             { "GreyscaleBt709", new GreyscaleBt709() },
-            //{ "GreyscaleBt601", new GreyscaleBt601() },
+            { "GreyscaleBt601", new GreyscaleBt601() },
         };
 
         [Theory]
diff --git a/tests/ImageProcessor.Tests/Processors/ProcessorTestBase.cs b/tests/ImageProcessor.Tests/Processors/ProcessorTestBase.cs
index 7f9e8ccc6..9ece3b02b 100644
--- a/tests/ImageProcessor.Tests/Processors/ProcessorTestBase.cs
+++ b/tests/ImageProcessor.Tests/Processors/ProcessorTestBase.cs
@@ -29,8 +29,8 @@ namespace ImageProcessor.Tests
             "../../TestImages/Formats/Png/splash.png",
             "../../TestImages/Formats/Gif/leaf.gif",
             "../../TestImages/Formats/Gif/rings.gif",
-            "../../TestImages/Formats/Gif/ani2.gif",
-            "../../TestImages/Formats/Gif/giphy.gif"
+            //"../../TestImages/Formats/Gif/ani2.gif",
+            //"../../TestImages/Formats/Gif/giphy.gif"
         };
     }
 }