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AlphaBlendCommand Class
See Also  Members   Example 
Leadtools.ImageProcessing.Effects Namespace : AlphaBlendCommand Class



Combines image data from two images, using a specific opacity value.

Syntax

Visual Basic (Declaration) 
Public Class AlphaBlendCommand 
   Inherits RasterCommand
   Implements IRasterCommand 
Visual Basic (Usage)Copy Code
Dim instance As AlphaBlendCommand
C# 
public class AlphaBlendCommand : RasterCommand, IRasterCommand 
C++/CLI 
public ref class AlphaBlendCommand : public RasterCommand, IRasterCommand 

Example

Run the AlphaBlendCommand on an image.

Visual BasicCopy Code
Public Sub AlphaBlendCommandExample()
   RasterCodecs.Startup()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim leadImage As RasterImage = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Master.jpg")

   ' Prepare the command
   Dim SrcImage As RasterImage
   SrcImage = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Image3.cmp", 4, CodecsLoadByteOrder.Bgr, 1, 1)

   Dim command As AlphaBlendCommand = New AlphaBlendCommand
   'Combine SrcImage with image, with half opacity.
   command.DestinationRectangle = New Rectangle(leadImage.Width \ 8, leadImage.Height \ 8, leadImage.Width, leadImage.Height)
   command.SourceImage = SrcImage
   command.Opacity = 128
   command.Run(leadImage)
   codecs.Save(leadImage, LeadtoolsExamples.Common.ImagesPath.Path + "Result.jpg", RasterImageFormat.Jpeg, 24)

   RasterCodecs.Shutdown()
End Sub
C#Copy Code
public void AlphaBlendCommandExample() 
{ 
   // Load an image 
   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Master.jpg"); 
 
   // Prepare the command 
   RasterImage SrcImage = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Image3.cmp", 4, CodecsLoadByteOrder.Bgr, 1, 1); 
 
   AlphaBlendCommand command = new AlphaBlendCommand(); 
   //Combine SrcImage with image, with half opacity. 
   command.DestinationRectangle = new Rectangle(image.Width / 8, image.Height / 8, image.Width, image.Height); 
   command.SourceImage = SrcImage; 
   command.Opacity = 128; 
   command.Run(image); 
   codecs.Save(image, LeadtoolsExamples.Common.ImagesPath.Path + "Result.jpg", RasterImageFormat.Jpeg, 24); 
 
   RasterCodecs.Shutdown(); 
}

Remarks

  • The opacity determines how much the affected image will show through the source image. For example, if the Opacity property (or the opacity parameter in the constructor) is set to 255 (completely opaque) then the source image will appear and the affected image will not show through the source image at all. If the opacity is 128 (half opacity), then the pixels for that area will consist of 50 percent from the source image and 50 percent from the affected image.
  • This command supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.
  • This command does not support signed data images.
  • This command does not support 32-bit grayscale images.
For more information, refer to Introduction to Image Processing With LEADTOOLS.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.Effects.AlphaBlendCommand

Requirements

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

See Also