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PremultiplyAlphaValuesCommand Class

Summary

Converts the image data to or from premultiplied alpha values.

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

Remarks

This command only works with images that are 32 or 64-bit bits per pixel.

Example

This example will load a 32-bit PNG image, and then convert the data to premultiplied alpha values.

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using LeadtoolsExamples.Common; 
 
public void PremultiplyAlphaValuesCommandExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string srcFileName = Path.Combine(ImagesPath.Path, "LittleGFlyingAlpha.png"); 
   string destFileName = Path.Combine(ImagesPath.Path, "PremultiplyAlphaValuesCommand.bmp"); 
 
   // Load the source image from disk 
   RasterImage image = codecs.Load(srcFileName); 
   Debug.Assert(image.BitsPerPixel == 32); 
 
   // Convert the image data to premultiplied alpha values 
   PremultiplyAlphaValuesCommand cmd = new PremultiplyAlphaValuesCommand(); 
   cmd.ConvertToPremultipliedValues = true; 
   cmd.Run(image); 
 
   // Save the image back to disk 
   codecs.Save(image, destFileName, RasterImageFormat.Bmp, 32); 
 
   // Clean Up 
   image.Dispose(); 
   codecs.Dispose(); 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
 
Public Sub PremultiplyAlphaValuesCommandExample() 
   Dim codecs As RasterCodecs = New RasterCodecs() 
 
   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "LittleGFlyingAlpha.png") 
   Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "PremultiplyAlphaValuesCommand.bmp") 
 
   ' Load the source image from disk 
   Dim image As RasterImage = codecs.Load(srcFileName) 
   Debug.Assert(image.BitsPerPixel = 32) 
 
   ' Convert the image data to premultiplied alpha values 
   Dim cmd As PremultiplyAlphaValuesCommand = New PremultiplyAlphaValuesCommand() 
   cmd.ConvertToPremultipliedValues = True 
   cmd.Run(image) 
 
   ' Save the image back to disk 
   codecs.Save(image, destFileName, RasterImageFormat.Bmp, 32) 
 
   ' Clean Up 
   image.Dispose() 
   codecs.Dispose() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class 

Requirements

Target Platforms

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