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FeatherAlphaBlendCommand Class
See Also  Members  
Leadtools.ImageProcessing.Effects Namespace : FeatherAlphaBlendCommand Class



Combines image data from two images with feathering. The two images can be combined with variable opacity applied by specifying the region of a fade mask image. Supported in Silverlight, Windows Phone 7

Object Model

FeatherAlphaBlendCommand Class

Syntax

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

Example

Run the Leadtools.ImageProcessing.Effects.FeatherAlphaBlendCommand on an image.

Visual BasicCopy Code
Public Sub FeatherAlphaBlendCommandExample()
   ' Load an image
   Dim codecs As RasterCodecs = New RasterCodecs()
   Dim backgroundImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"))
   Dim sourceImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "LittleGFlyingAlpha.png"), 32, CodecsLoadByteOrder.Bgr, 1, 1)
   Dim command As FeatherAlphaBlendCommand = New FeatherAlphaBlendCommand()
   command.DestinationRectangle = New LeadRect(0, 0, sourceImage.Width, sourceImage.Height)
   command.MaskImage = sourceImage.CreateAlphaImage()
   command.SourceImage = sourceImage
   command.SourcePoint = New LeadPoint(0, 0)
   command.Run(backgroundImage)
   codecs.Save(backgroundImage, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24)
End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
C#Copy Code
public void FeatherAlphaBlendCommandExample()
   {
      // Load an image
      RasterCodecs codecs = new RasterCodecs();
      RasterImage backgroundImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"));
      RasterImage sourceImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "LittleGFlyingAlpha.png"), 32, CodecsLoadByteOrder.Bgr, 1, 1);
      FeatherAlphaBlendCommand command = new FeatherAlphaBlendCommand();
      command.DestinationRectangle = new LeadRect(0, 0, sourceImage.Width, sourceImage.Height);
      command.MaskImage = sourceImage.CreateAlphaImage();
      command.SourceImage = sourceImage;
      command.SourcePoint = new LeadPoint(0, 0);
      command.Run(backgroundImage);
      codecs.Save(backgroundImage, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24);
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
SilverlightCSharpCopy Code
public void FeatherAlphaBlendCommandExample(RasterImage image, RasterImage maskImage, RasterImage sourceImage, Stream outStream)
{
   FeatherAlphaBlendCommand command = new FeatherAlphaBlendCommand();
   command.DestinationRectangle = new LeadRect(0, 0, image.Width / 2, image.Height / 2);
   command.MaskImage = maskImage;
   command.SourcePoint = new LeadPoint(image.Width / 2, image.Height / 2);
   command.SourceImage = sourceImage;
   command.Run(image);
   // Save result image
   RasterCodecs codecs = new RasterCodecs();
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24);
   image.Dispose();
   maskImage.Dispose();
   sourceImage.Dispose();
}
SilverlightVBCopy Code
Public Sub FeatherAlphaBlendCommandExample(ByVal image As RasterImage, ByVal maskImage As RasterImage, ByVal sourceImage As RasterImage, ByVal outStream As Stream)
   Dim command As FeatherAlphaBlendCommand = New FeatherAlphaBlendCommand()
   command.DestinationRectangle = New LeadRect(0, 0, image.Width / 2, image.Height / 2)
   command.MaskImage = maskImage
   command.SourcePoint = New LeadPoint(image.Width / 2, image.Height / 2)
   command.SourceImage = sourceImage
   command.Run(image)
   ' Save result image
   Dim codecs As RasterCodecs = New RasterCodecs()
   codecs.Save(image, outStream, RasterImageFormat.Jpeg, 24)
   image.Dispose()
   maskImage.Dispose()
   sourceImage.Dispose()
End Sub

Remarks

  • To combine two images with a fixed opacity, use the AlphaBlendCommand.
  • The FeatherAlphaBlendCommand achieves feathering between two images by using variable opacity values, obtained from the fade mask referenced by MaskImage. Use the MaskSourcePoint to specify a region of the mask image, these values are the coordinates of the origin of the mask rectangle.
  • To create an image that contains a fade mask, use FadedMaskCommand command.
  • 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.FeatherAlphaBlendCommand

Requirements

Target Platforms: Silverlight 3.0, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7, MAC OS/X (Intel Only)

See Also