How to change brightness of image on WPF image viewer?

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For processing (for example, changing the brightness) an image in image viewer you need do the following steps:

Create an instance of the WpfImageViewerProcessingTool class - a visual tool, which allows to process rectangular area in image viewer.
Specify the image processing command, which must be used by visual tool for processing the image region in image viewer.
Set the visual tool as the current tool of image viewer.

Here is C#/VB.NET code that shows how to change the brightness of visible area of WpfImageViewer:

/// <summary>
/// Adds the visual tool, which changes brightness of visible area of image viewer, to the image viewer.
/// </summary>
/// <param name="imageViewer">The image viewer.</param>
/// <param name="imageBrightness">The image brightness value in percents. Valid values are from -100 to 100.</param>
public void AddVisualToolForProcessingVisibleAreaInImageViewer(
    Vintasoft.Imaging.Wpf.UI.WpfImageViewer imageViewer,
    int imageBrightness)
{
    // create command for changing of image brightness
    Vintasoft.Imaging.ImageProcessing.Color.ChangeBrightnessCommand changeBrightness =
        new Vintasoft.Imaging.ImageProcessing.Color.ChangeBrightnessCommand();
    // set the command parameters
    changeBrightness.Brightness = imageBrightness;

    // create an instance of the ImageViewerProcessingTool class
    Vintasoft.Imaging.Wpf.UI.VisualTools.WpfImageViewerProcessingTool viewerProcessingTool =
        new Vintasoft.Imaging.Wpf.UI.VisualTools.WpfImageViewerProcessingTool();
    // specify that visual tool must use the command for processing visible area in image viewer
    viewerProcessingTool.ProcessingCommand = changeBrightness;

    // set the tool as the current tool of the ImageViewer
    imageViewer.VisualTool = viewerProcessingTool;
}

VB.NET

''' <summary>
''' Adds the visual tool, which changes brightness of visible area of image viewer, to the image viewer.
''' </summary>
''' <param name="imageViewer">The image viewer.</param>
''' <param name="imageBrightness">The image brightness value in percents. Valid values are from -100 to 100.</param>
Public Sub AddVisualToolForProcessingVisibleAreaInImageViewer(imageViewer As Vintasoft.Imaging.Wpf.UI.WpfImageViewer, imageBrightness As Integer)
    ' create command for changing of image brightness
    Dim changeBrightness As New Vintasoft.Imaging.ImageProcessing.Color.ChangeBrightnessCommand()
    ' set the command parameters
    changeBrightness.Brightness = imageBrightness

    ' create an instance of the ImageViewerProcessingTool class
    Dim viewerProcessingTool As New Vintasoft.Imaging.Wpf.UI.VisualTools.WpfImageViewerProcessingTool()
    ' specify that visual tool must use the command for processing visible area in image viewer
    viewerProcessingTool.ProcessingCommand = changeBrightness

    ' set the tool as the current tool of the ImageViewer
    imageViewer.VisualTool = viewerProcessingTool
End Sub

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