Converts the image data to or from premultiplied alpha values.
public class PremultiplyAlphaValuesCommand : RasterCommand
Public Class PremultiplyAlphaValuesCommand
Inherits RasterCommand
@interface LTPremultiplyAlphaValuesCommand : LTRasterCommand
public class PremultiplyAlphaValuesCommand extends RasterCommand
public ref class PremultiplyAlphaValuesCommand : public RasterCommand
This command only works with images that are 32 or 64-bit bits per pixel.
This example will load a 32-bit PNG image, and then convert the data to premultiplied alpha values.
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
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