/// <summary>
/// Applies greyscale toning to the image.
/// </summary>
/// <param name="source">The image this method extends.</param>
/// <param name="rectangle">
/// The <see cref="Rectangle"/> structure that specifies the portion of the image object to alter.
/// </param>
/// <param name="mode">The formula to apply to perform the operation.</param>
/// <param name="progressHandler">A delegate which is called as progress is made processing the image.</param>
/// <returns>The <see cref="Image"/>.</returns>
public static Image Greyscale(this Image source, Rectangle rectangle, GreyscaleMode mode = GreyscaleMode.Bt709, ProgressEventHandler progressHandler = null)
{
IImageProcessor processor = mode == GreyscaleMode.Bt709
? (IImageProcessor)new GreyscaleBt709()
: new GreyscaleBt601();
processor.OnProgress += progressHandler;
try
{
return source.Process(rectangle, processor);
}
finally
{
processor.OnProgress -= progressHandler;
}
}
/// <summary>
/// Applies greyscale toning to the image.
/// </summary>
/// <param name="source">The image this method extends.</param>
/// <param name="mode">The formula to apply to perform the operation.</param>
/// <param name="progressHandler">A delegate which is called as progress is made processing the image.</param>
/// <returns>The <see cref="Image"/>.</returns>
public static Image Greyscale(this Image source, GreyscaleMode mode = GreyscaleMode.Bt709, ProgressEventHandler progressHandler = null)
{
return Greyscale(source, source.Bounds, mode, progressHandler);
}
