Fix Tests

Merge IImageFilteringProcessor with IImageProcessor to simplify
encapsulation and allow easy setting of parallel options

src/ImageSharp/Drawing/Processors/DrawImageProcessor.cs

@@ -13,7 +13,7 @@ namespace ImageSharp.Processors
     /// Combines two images together by blending the pixels.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class DrawImageProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class DrawImageProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Drawing/Processors/DrawPathProcessor.cs

@@ -20,8 +20,8 @@ namespace ImageSharp.Drawing.Processors
     /// Draws a path using the processor pipeline
     /// </summary>
     /// <typeparam name="TColor">The type of the color.</typeparam>
-    /// <seealso cref="ImageSharp.Processors.ImageFilteringProcessor{TColor}" />
-    public class DrawPathProcessor<TColor> : ImageFilteringProcessor<TColor>
+    /// <seealso cref="ImageSharp.Processors.ImageProcessor{TColor}" />
+    public class DrawPathProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         private const float AntialiasFactor = 1f;

src/ImageSharp/Drawing/Processors/FillProcessor.cs

@@ -16,7 +16,7 @@ namespace ImageSharp.Drawing.Processors
     /// Using the bursh as a source of pixels colors blends the brush color with source.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class FillProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class FillProcessor<TColor> : ImageProcessor<TColor>
     where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Drawing/Processors/FillShapeProcessor.cs

@@ -17,8 +17,8 @@ namespace ImageSharp.Drawing.Processors
     /// Usinf a brsuh and a shape fills shape with contents of brush the
     /// </summary>
     /// <typeparam name="TColor">The type of the color.</typeparam>
-    /// <seealso cref="ImageSharp.Processors.ImageFilteringProcessor{TColor}" />
-    public class FillShapeProcessor<TColor> : ImageFilteringProcessor<TColor>
+    /// <seealso cref="ImageSharp.Processors.ImageProcessor{TColor}" />
+    public class FillShapeProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         private const float AntialiasFactor = 1f;

src/ImageSharp/Filters/ColorMatrix/ColorBlindness.cs

@@ -40,7 +40,7 @@ namespace ImageSharp
         public static Image<TColor> ColorBlindness<TColor>(this Image<TColor> source, ColorBlindness colorBlindness, Rectangle rectangle)
             where TColor : struct, IPackedPixel, IEquatable<TColor>
         {
-            IImageFilteringProcessor<TColor> processor;
+            IImageProcessor<TColor> processor;
 
             switch (colorBlindness)
             {

src/ImageSharp/Filters/ColorMatrix/Grayscale.cs

@@ -40,8 +40,8 @@ namespace ImageSharp
         public static Image<TColor> Grayscale<TColor>(this Image<TColor> source, Rectangle rectangle, GrayscaleMode mode = GrayscaleMode.Bt709)
             where TColor : struct, IPackedPixel, IEquatable<TColor>
         {
-            IImageFilteringProcessor<TColor> processor = mode == GrayscaleMode.Bt709
-                ? (IImageFilteringProcessor<TColor>)new GrayscaleBt709Processor<TColor>()
+            IImageProcessor<TColor> processor = mode == GrayscaleMode.Bt709
+                ? (IImageProcessor<TColor>)new GrayscaleBt709Processor<TColor>()
                 : new GrayscaleBt601Processor<TColor>();
 
             return source.Process(rectangle, processor);

src/ImageSharp/Filters/Processors/Binarization/BinaryThresholdProcessor.cs

@@ -9,11 +9,11 @@ namespace ImageSharp.Processors
     using System.Threading.Tasks;
 
     /// <summary>
-    /// An <see cref="IImageFilteringProcessor{TColor}"/> to perform binary threshold filtering against an
+    /// An <see cref="IImageProcessor{TColor}"/> to perform binary threshold filtering against an
     /// <see cref="Image"/>. The image will be converted to grayscale before thresholding occurs.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class BinaryThresholdProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class BinaryThresholdProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/ColorMatrix/ColorMatrixFilter.cs

@@ -13,7 +13,7 @@ namespace ImageSharp.Processors
     /// The color matrix filter. Inherit from this class to perform operation involving color matrices.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public abstract class ColorMatrixFilter<TColor> : ImageFilteringProcessor<TColor>, IColorMatrixFilter<TColor>
+    public abstract class ColorMatrixFilter<TColor> : ImageProcessor<TColor>, IColorMatrixFilter<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <inheritdoc/>

src/ImageSharp/Filters/Processors/ColorMatrix/IColorMatrixFilter.cs

@@ -13,7 +13,7 @@ namespace ImageSharp.Processors
     /// alter the image pixels.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public interface IColorMatrixFilter<TColor> : IImageFilteringProcessor<TColor>
+    public interface IColorMatrixFilter<TColor> : IImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Convolution/BoxBlurProcessor.cs

@@ -11,7 +11,7 @@ namespace ImageSharp.Processors
     /// Applies a Box blur sampler to the image.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class BoxBlurProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class BoxBlurProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Convolution/Convolution2DProcessor.cs

@@ -13,7 +13,7 @@ namespace ImageSharp.Processors
     /// Defines a sampler that uses two one-dimensional matrices to perform convolution against an image.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class Convolution2DProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class Convolution2DProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Convolution/Convolution2PassProcessor.cs

@@ -13,7 +13,7 @@ namespace ImageSharp.Processors
     /// Defines a sampler that uses two one-dimensional matrices to perform two-pass convolution against an image.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class Convolution2PassProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class Convolution2PassProcessor<TColor> : ImageProcessor<TColor>
     where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Convolution/ConvolutionProcessor.cs

@@ -13,7 +13,7 @@ namespace ImageSharp.Processors
     /// Defines a sampler that uses a 2 dimensional matrix to perform convolution against an image.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class ConvolutionProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class ConvolutionProcessor<TColor> : ImageProcessor<TColor>
     where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Convolution/EdgeDetection/EdgeDetector2DProcessor.cs

@@ -11,7 +11,7 @@ namespace ImageSharp.Processors
     /// Defines a sampler that detects edges within an image using two one-dimensional matrices.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public abstract class EdgeDetector2DProcessor<TColor> : ImageFilteringProcessor<TColor>, IEdgeDetectorProcessor<TColor>
+    public abstract class EdgeDetector2DProcessor<TColor> : ImageProcessor<TColor>, IEdgeDetectorProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Convolution/EdgeDetection/EdgeDetectorCompassProcessor.cs

@@ -13,7 +13,7 @@ namespace ImageSharp.Processors
     /// Defines a sampler that detects edges within an image using a eight two dimensional matrices.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public abstract class EdgeDetectorCompassProcessor<TColor> : ImageFilteringProcessor<TColor>, IEdgeDetectorProcessor<TColor>
+    public abstract class EdgeDetectorCompassProcessor<TColor> : ImageProcessor<TColor>, IEdgeDetectorProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Convolution/EdgeDetection/EdgeDetectorProcessor.cs

@@ -11,7 +11,7 @@ namespace ImageSharp.Processors
     /// Defines a sampler that detects edges within an image using a single two dimensional matrix.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public abstract class EdgeDetectorProcessor<TColor> : ImageFilteringProcessor<TColor>, IEdgeDetectorProcessor<TColor>
+    public abstract class EdgeDetectorProcessor<TColor> : ImageProcessor<TColor>, IEdgeDetectorProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <inheritdoc/>

src/ImageSharp/Filters/Processors/Convolution/EdgeDetection/IEdgeDetectorProcessor.cs

@@ -11,7 +11,7 @@ namespace ImageSharp.Processors
     /// Provides properties and methods allowing the detection of edges within an image.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public interface IEdgeDetectorProcessor<TColor> : IImageFilteringProcessor<TColor>, IEdgeDetectorProcessor
+    public interface IEdgeDetectorProcessor<TColor> : IImageProcessor<TColor>, IEdgeDetectorProcessor
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
     }

src/ImageSharp/Filters/Processors/Convolution/GaussianBlurProcessor.cs

@@ -11,7 +11,7 @@ namespace ImageSharp.Processors
     /// Applies a Gaussian blur sampler to the image.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class GaussianBlurProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class GaussianBlurProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Convolution/GaussianSharpenProcessor.cs

@@ -11,7 +11,7 @@ namespace ImageSharp.Processors
     /// Applies a Gaussian sharpening sampler to the image.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class GaussianSharpenProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class GaussianSharpenProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Effects/AlphaProcessor.cs

@@ -10,10 +10,10 @@ namespace ImageSharp.Processors
     using System.Threading.Tasks;
 
     /// <summary>
-    /// An <see cref="IImageFilteringProcessor{TColor}"/> to change the alpha component of an <see cref="Image{TColor}"/>.
+    /// An <see cref="IImageProcessor{TColor}"/> to change the alpha component of an <see cref="Image{TColor}"/>.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class AlphaProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class AlphaProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Effects/BackgroundColorProcessor.cs

@@ -13,7 +13,7 @@ namespace ImageSharp.Processors
     /// Sets the background color of the image.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class BackgroundColorProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class BackgroundColorProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Effects/BrightnessProcessor.cs

@@ -10,10 +10,10 @@ namespace ImageSharp.Processors
     using System.Threading.Tasks;
 
     /// <summary>
-    /// An <see cref="IImageFilteringProcessor{TColor}"/> to change the brightness of an <see cref="Image{TColor}"/>.
+    /// An <see cref="IImageProcessor{TColor}"/> to change the brightness of an <see cref="Image{TColor}"/>.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class BrightnessProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class BrightnessProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Effects/ContrastProcessor.cs

@@ -10,10 +10,10 @@ namespace ImageSharp.Processors
     using System.Threading.Tasks;
 
     /// <summary>
-    /// An <see cref="IImageFilteringProcessor{TColor}"/> to change the contrast of an <see cref="Image{TColor}"/>.
+    /// An <see cref="IImageProcessor{TColor}"/> to change the contrast of an <see cref="Image{TColor}"/>.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class ContrastProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class ContrastProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Effects/InvertProcessor.cs

@@ -10,10 +10,10 @@ namespace ImageSharp.Processors
     using System.Threading.Tasks;
 
     /// <summary>
-    /// An <see cref="IImageFilteringProcessor{TColor}"/> to invert the colors of an <see cref="Image{TColor}"/>.
+    /// An <see cref="IImageProcessor{TColor}"/> to invert the colors of an <see cref="Image{TColor}"/>.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class InvertProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class InvertProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <inheritdoc/>

src/ImageSharp/Filters/Processors/Effects/OilPaintingProcessor.cs

@@ -10,11 +10,11 @@ namespace ImageSharp.Processors
     using System.Threading.Tasks;
 
     /// <summary>
-    /// An <see cref="IImageFilteringProcessor{TColor}"/> to apply an oil painting effect to an <see cref="Image{TColor}"/>.
+    /// An <see cref="IImageProcessor{TColor}"/> to apply an oil painting effect to an <see cref="Image{TColor}"/>.
     /// </summary>
     /// <remarks>Adapted from <see href="https://softwarebydefault.com/2013/06/29/oil-painting-cartoon-filter/"/> by Dewald Esterhuizen.</remarks>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class OilPaintingProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class OilPaintingProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Effects/PixelateProcessor.cs

@@ -10,10 +10,10 @@ namespace ImageSharp.Processors
     using System.Threading.Tasks;
 
     /// <summary>
-    /// An <see cref="IImageFilteringProcessor{TColor}"/> to pixelate the colors of an <see cref="Image{TColor}"/>.
+    /// An <see cref="IImageProcessor{TColor}"/> to pixelate the colors of an <see cref="Image{TColor}"/>.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class PixelateProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class PixelateProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/IImageFilteringProcessor.cs

@@ -1,36 +0,0 @@
-// <copyright file="IImageFilteringProcessor.cs" company="James Jackson-South">
-// Copyright (c) James Jackson-South and contributors.
-// Licensed under the Apache License, Version 2.0.
-// </copyright>
-
-namespace ImageSharp.Processors
-{
-    using System;
-
-    /// <summary>
-    /// Encapsulates methods to alter the pixels of an image. The processor operates on the original source pixels.
-    /// </summary>
-    /// <typeparam name="TColor">The pixel format.</typeparam>
-    public interface IImageFilteringProcessor<TColor> : IImageProcessor
-        where TColor : struct, IPackedPixel, IEquatable<TColor>
-    {
-        /// <summary>
-        /// Applies the process to the specified portion of the specified <see cref="ImageBase{TColor}"/>.
-        /// </summary>
-        /// <param name="source">The source image. Cannot be null.</param>
-        /// <param name="sourceRectangle">
-        /// The <see cref="Rectangle"/> structure that specifies the portion of the image object to draw.
-        /// </param>
-        /// <remarks>
-        /// The method keeps the source image unchanged and returns the
-        /// the result of image processing filter as new image.
-        /// </remarks>
-        /// <exception cref="System.ArgumentNullException">
-        /// <paramref name="source"/> is null.
-        /// </exception>
-        /// <exception cref="System.ArgumentException">
-        /// <paramref name="sourceRectangle"/> doesnt fit the dimension of the image.
-        /// </exception>
-        void Apply(ImageBase<TColor> source, Rectangle sourceRectangle);
-    }
-}

src/ImageSharp/Filters/Processors/ImageFilteringProcessor.cs

@@ -1,66 +0,0 @@
-// <copyright file="ImageFilteringProcessor.cs" company="James Jackson-South">
-// Copyright (c) James Jackson-South and contributors.
-// Licensed under the Apache License, Version 2.0.
-// </copyright>
-
-namespace ImageSharp.Processors
-{
-    using System;
-
-    /// <summary>
-    /// Encapsulates methods to alter the pixels of an image. The processor operates on the original source pixels.
-    /// </summary>
-    /// <typeparam name="TColor">The pixel format.</typeparam>
-    public abstract class ImageFilteringProcessor<TColor> : ImageProcessor<TColor>, IImageFilteringProcessor<TColor>
-        where TColor : struct, IPackedPixel, IEquatable<TColor>
-    {
-        /// <inheritdoc/>
-        public void Apply(ImageBase<TColor> source, Rectangle sourceRectangle)
-        {
-            try
-            {
-                this.BeforeApply(source, sourceRectangle);
-
-                this.OnApply(source, sourceRectangle);
-
-                this.AfterApply(source, sourceRectangle);
-            }
-            catch (Exception ex)
-            {
-                throw new ImageProcessingException($"An error occured when processing the image using {this.GetType().Name}. See the inner exception for more detail.", ex);
-            }
-        }
-
-        /// <summary>
-        /// This method is called before the process is applied to prepare the processor.
-        /// </summary>
-        /// <param name="source">The source image. Cannot be null.</param>
-        /// <param name="sourceRectangle">
-        /// The <see cref="Rectangle"/> structure that specifies the portion of the image object to draw.
-        /// </param>
-        protected virtual void BeforeApply(ImageBase<TColor> source, Rectangle sourceRectangle)
-        {
-        }
-
-        /// <summary>
-        /// Applies the process to the specified portion of the specified <see cref="ImageBase{TColor}"/> at the specified location
-        /// and with the specified size.
-        /// </summary>
-        /// <param name="source">The source image. Cannot be null.</param>
-        /// <param name="sourceRectangle">
-        /// The <see cref="Rectangle"/> structure that specifies the portion of the image object to draw.
-        /// </param>
-        protected abstract void OnApply(ImageBase<TColor> source, Rectangle sourceRectangle);
-
-        /// <summary>
-        /// This method is called after the process is applied to prepare the processor.
-        /// </summary>
-        /// <param name="source">The source image. Cannot be null.</param>
-        /// <param name="sourceRectangle">
-        /// The <see cref="Rectangle"/> structure that specifies the portion of the image object to draw.
-        /// </param>
-        protected virtual void AfterApply(ImageBase<TColor> source, Rectangle sourceRectangle)
-        {
-        }
-    }
-}

src/ImageSharp/Filters/Processors/Overlays/GlowProcessor.cs

@@ -10,10 +10,10 @@ namespace ImageSharp.Processors
     using System.Threading.Tasks;
 
     /// <summary>
-    /// An <see cref="IImageFilteringProcessor{TColor}"/> that applies a radial glow effect an <see cref="Image{TColor}"/>.
+    /// An <see cref="IImageProcessor{TColor}"/> that applies a radial glow effect an <see cref="Image{TColor}"/>.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class GlowProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class GlowProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Overlays/VignetteProcessor.cs

@@ -10,10 +10,10 @@ namespace ImageSharp.Processors
     using System.Threading.Tasks;
 
     /// <summary>
-    /// An <see cref="IImageFilteringProcessor{TColor}"/> that applies a radial vignette effect to an <see cref="Image{TColor}"/>.
+    /// An <see cref="IImageProcessor{TColor}"/> that applies a radial vignette effect to an <see cref="Image{TColor}"/>.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class VignetteProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class VignetteProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Transforms/CropProcessor.cs

@@ -12,7 +12,7 @@ namespace ImageSharp.Processors
     /// Provides methods to allow the cropping of an image.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class CropProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class CropProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Transforms/EntropyCropProcessor.cs

@@ -12,7 +12,7 @@ namespace ImageSharp.Processors
     /// entropy.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class EntropyCropProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class EntropyCropProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Transforms/FlipProcessor.cs

@@ -12,7 +12,7 @@ namespace ImageSharp.Processors
     /// Provides methods that allow the flipping of an image around its center point.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public class FlipProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public class FlipProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Transforms/Matrix3x2Processor.cs

@@ -12,7 +12,7 @@ namespace ImageSharp.Processors
     /// Provides methods to transform an image using a <see cref="Matrix3x2"/>.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public abstract class Matrix3x2Processor<TColor> : ImageFilteringProcessor<TColor>
+    public abstract class Matrix3x2Processor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Filters/Processors/Transforms/ResamplingWeightedProcessor.cs

@@ -12,7 +12,7 @@ namespace ImageSharp.Processors
     /// Adapted from <see href="http://www.realtimerendering.com/resources/GraphicsGems/gemsiii/filter_rcg.c"/>
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public abstract class ResamplingWeightedProcessor<TColor> : ImageFilteringProcessor<TColor>
+    public abstract class ResamplingWeightedProcessor<TColor> : ImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>

src/ImageSharp/Image/IImageProcessor.cs

@@ -5,12 +5,15 @@
 
 namespace ImageSharp.Processors
 {
+    using System;
     using System.Threading.Tasks;
 
     /// <summary>
     /// Encapsulates methods to alter the pixels of an image.
     /// </summary>
-    public interface IImageProcessor
+    /// <typeparam name="TColor">The pixel format.</typeparam>
+    public interface IImageProcessor<TColor>
+        where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <summary>
         /// Gets or sets the parallel options for processing tasks in parallel.
@@ -22,5 +25,20 @@ namespace ImageSharp.Processors
         /// or expand individual pixel colors the value on processing.
         /// </summary>
         bool Compand { get; set; }
+
+        /// <summary>
+        /// Applies the process to the specified portion of the specified <see cref="ImageBase{TColor}"/>.
+        /// </summary>
+        /// <param name="source">The source image. Cannot be null.</param>
+        /// <param name="sourceRectangle">
+        /// The <see cref="Rectangle"/> structure that specifies the portion of the image object to draw.
+        /// </param>
+        /// <exception cref="System.ArgumentNullException">
+        /// <paramref name="source"/> is null.
+        /// </exception>
+        /// <exception cref="System.ArgumentException">
+        /// <paramref name="sourceRectangle"/> doesnt fit the dimension of the image.
+        /// </exception>
+        void Apply(ImageBase<TColor> source, Rectangle sourceRectangle);
     }
 }

src/ImageSharp/Image/ImageProcessingExtensions.cs

@@ -21,7 +21,7 @@ namespace ImageSharp
         /// <param name="source">The image this method extends.</param>
         /// <param name="processor">The processor to apply to the image.</param>
         /// <returns>The <see cref="Image{TColor}"/>.</returns>
-        internal static Image<TColor> Process<TColor>(this Image<TColor> source, IImageFilteringProcessor<TColor> processor)
+        internal static Image<TColor> Process<TColor>(this Image<TColor> source, IImageProcessor<TColor> processor)
             where TColor : struct, IPackedPixel, IEquatable<TColor>
         {
             return Process(source, source.Bounds, processor);
@@ -38,14 +38,9 @@ namespace ImageSharp
         /// </param>
         /// <param name="processor">The processors to apply to the image.</param>
         /// <returns>The <see cref="Image{TColor}"/>.</returns>
-        internal static Image<TColor> Process<TColor>(this Image<TColor> source, Rectangle sourceRectangle, IImageFilteringProcessor<TColor> processor)
+        internal static Image<TColor> Process<TColor>(this Image<TColor> source, Rectangle sourceRectangle, IImageProcessor<TColor> processor)
             where TColor : struct, IPackedPixel, IEquatable<TColor>
         {
-            if (processor.ParallelOptions == null)
-            {
-                processor.ParallelOptions = source.Bootstrapper.ParallelOptions;
-            }
-
             return PerformAction(source, (sourceImage) => processor.Apply(sourceImage, sourceRectangle));
         }
 

src/ImageSharp/ImageProcessor.cs

@@ -12,7 +12,7 @@ namespace ImageSharp.Processors
     /// Allows the application of processors to images.
     /// </summary>
     /// <typeparam name="TColor">The pixel format.</typeparam>
-    public abstract class ImageProcessor<TColor> : IImageProcessor
+    public abstract class ImageProcessor<TColor> : IImageProcessor<TColor>
         where TColor : struct, IPackedPixel, IEquatable<TColor>
     {
         /// <inheritdoc/>
@@ -20,5 +20,59 @@ namespace ImageSharp.Processors
 
         /// <inheritdoc/>
         public virtual bool Compand { get; set; } = false;
+
+        /// <inheritdoc/>
+        public void Apply(ImageBase<TColor> source, Rectangle sourceRectangle)
+        {
+            if (this.ParallelOptions == null)
+            {
+                this.ParallelOptions = source.Bootstrapper.ParallelOptions;
+            }
+
+            try
+            {
+                this.BeforeApply(source, sourceRectangle);
+
+                this.OnApply(source, sourceRectangle);
+
+                this.AfterApply(source, sourceRectangle);
+            }
+            catch (Exception ex)
+            {
+                throw new ImageProcessingException($"An error occured when processing the image using {this.GetType().Name}. See the inner exception for more detail.", ex);
+            }
+        }
+
+        /// <summary>
+        /// This method is called before the process is applied to prepare the processor.
+        /// </summary>
+        /// <param name="source">The source image. Cannot be null.</param>
+        /// <param name="sourceRectangle">
+        /// The <see cref="Rectangle"/> structure that specifies the portion of the image object to draw.
+        /// </param>
+        protected virtual void BeforeApply(ImageBase<TColor> source, Rectangle sourceRectangle)
+        {
+        }
+
+        /// <summary>
+        /// Applies the process to the specified portion of the specified <see cref="ImageBase{TColor}"/> at the specified location
+        /// and with the specified size.
+        /// </summary>
+        /// <param name="source">The source image. Cannot be null.</param>
+        /// <param name="sourceRectangle">
+        /// The <see cref="Rectangle"/> structure that specifies the portion of the image object to draw.
+        /// </param>
+        protected abstract void OnApply(ImageBase<TColor> source, Rectangle sourceRectangle);
+
+        /// <summary>
+        /// This method is called after the process is applied to prepare the processor.
+        /// </summary>
+        /// <param name="source">The source image. Cannot be null.</param>
+        /// <param name="sourceRectangle">
+        /// The <see cref="Rectangle"/> structure that specifies the portion of the image object to draw.
+        /// </param>
+        protected virtual void AfterApply(ImageBase<TColor> source, Rectangle sourceRectangle)
+        {
+        }
     }
 }