VintaSoft Imaging .NET SDK 12.3: Documentation for .NET developer
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    How to change the image brightness in WinForms image viewer?
    In This Topic
    For processing (for example, changing the brightness) an image in image viewer you need do the following steps:

    Here is an example 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;
    }
    
    ''' <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