How to change the image brightness in WinForms 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 ImageViewerProcessingTool 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 ImageViewer:

/// <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.UI.ImageViewer imageViewer,
    int imageBrightness)
{
    // create command for changing of image brightness
    Vintasoft.Imaging.ImageProcessing.Color.ChangeBrightnessCommand changeBrightnessCommand = 
        new Vintasoft.Imaging.ImageProcessing.Color.ChangeBrightnessCommand();
    // set the command parameters
    changeBrightnessCommand.Brightness = imageBrightness;

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

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

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.UI.ImageViewer, imageBrightness As Integer)
    ' create command for changing of image brightness
    Dim changeBrightnessCommand As New Vintasoft.Imaging.ImageProcessing.Color.ChangeBrightnessCommand()
    ' set the command parameters
    changeBrightnessCommand.Brightness = imageBrightness

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

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

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