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FeatherAlphaBlendCommand Class

Summary

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.

Syntax
C#
VB
Objective-C
C++
Java
public class FeatherAlphaBlendCommand : RasterCommand 
Public Class FeatherAlphaBlendCommand  
   Inherits RasterCommand 
@interface LTFeatherAlphaBlendCommand : LTRasterCommand 
public class FeatherAlphaBlendCommand extends RasterCommand 
public ref class FeatherAlphaBlendCommand : public RasterCommand   

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.

Example

Run the FeatherAlphaBlendCommand on an image.

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Effects; 
 
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"; 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Effects 
 
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#[Silverlight C# Example] 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Effects; 
using Leadtools.Examples; 
 
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(); 
} 
vb[Silverlight VB Example] 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing.Effects 
 
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 

Requirements

Target Platforms

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Leadtools.ImageProcessing.Effects Assembly