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PremultiplyAlphaValuesCommand Class

Summary
Converts the image data to or from premultiplied alpha values.
Syntax
C#
VB
Objective-C
C++
Java
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; 
 
 
public void PremultiplyAlphaValuesCommandExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "LittleGFlyingAlpha.png"); 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "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(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
} 
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:\LEADTOOLS21\Resources\Images" 
End Class 
Requirements

Target Platforms

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