Change the alpha factor of an image

Visual Basic

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<Test> _ Public Sub MedicalViewerAlphaExample1()    Dim myForm As MedicalViewerForm = GetMedicalControl()    Dim medicalViewer As MedicalViewer = myForm.Viewer    Dim windowLevel As MedicalViewerWindowLevel = CType(medicalViewer.GetActionProperties(MedicalViewerActionType.WindowLevel, 0, 0), MedicalViewerWindowLevel)    Select Case windowLevel.LookupTableType       Case MedicalViewerLookupTableType.Exponential, MedicalViewerLookupTableType.Logarithmic, MedicalViewerLookupTableType.Sigmoid          Dim alpha As MedicalViewerAlpha = CType(medicalViewer.GetActionProperties(MedicalViewerActionType.Alpha, 0, 0), MedicalViewerAlpha)          alpha.Alpha += 100          medicalViewer.SetActionProperties(MedicalViewerActionType.Alpha, alpha, 0, 0)       Case Else    End Select    myForm.ShowDialog() End Sub

C#

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public void MedicalViewerAlphaExample1()  {     MedicalViewerForm myForm  = GetMedicalControl();     MedicalViewer medicalViewer = myForm.Viewer;       MedicalViewerWindowLevel windowLevel = (MedicalViewerWindowLevel)medicalViewer.GetActionProperties(MedicalViewerActionType.WindowLevel, 0, 0);       switch(windowLevel.LookupTableType)     {        case MedicalViewerLookupTableType.Exponential:        case MedicalViewerLookupTableType.Logarithmic:        case MedicalViewerLookupTableType.Sigmoid:           MedicalViewerAlpha alpha = (MedicalViewerAlpha)medicalViewer.GetActionProperties(MedicalViewerActionType.Alpha, 0, 0);           alpha.Alpha += 100;           medicalViewer.SetActionProperties(MedicalViewerActionType.Alpha, alpha, 0, 0);           break;        default:           break;     }     myForm.ShowDialog();  }

To set the properties of the alpha channel, call the SetActionProperties method. To retrieve the properties call the GetActionProperties method.

Alpha is the standard name for the Factor Value that indicates the factor to be applied to the lookup table. It is important to set the value of the lookup table to one of the following types: Sigmoid, Logarithmic or exponential. Valid values range from -1000 to 1000.

The mouse controls the actions as follows:

• Click and hold the mouse to start the effect. When the assigned mouse button is released the action ends.
• Dragging the mouse to the left decreases the center parameter.
• Dragging the mouse to the right increases the center parameter.
• Dragging the mouse up decreases the width parameter.
• Dragging the mouse down increases the width parameter.

System.Object
   Leadtools.MedicalViewer.MedicalViewerBaseAction
      Leadtools.MedicalViewer.MedicalViewerCommonActions
         Leadtools.MedicalViewer.MedicalViewerAlpha

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

Reference