SetAlphaValuesCommand Class

Summary

Fills the image alpha values, while preserving the other image components.

Syntax

Objective-C

C++

Java

public class SetAlphaValuesCommand : RasterCommand

Public Class SetAlphaValuesCommand  
   Inherits RasterCommand

@interface LTSetAlphaValuesCommand : LTRasterCommand

public class SetAlphaValuesCommand extends RasterCommand

public ref class SetAlphaValuesCommand : public RasterCommand

Remarks

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

Example

This example will load an image, convert it to 32-bit/pixel and then set the alpha values to half the maximum allowed

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using LeadtoolsExamples.Common; 
 
public void SetAlphaValuesCommandExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string srcFileName = Path.Combine(ImagesPath.Path, "Image1.cmp"); 
   string destFileName = Path.Combine(ImagesPath.Path, "SetAlphaValuesCommand.bmp"); 
 
   // Load the source image from disk 
   RasterImage image = codecs.Load(srcFileName); 
 
   // Convert the image to 32-bits/pixel 
   ColorResolutionCommand colorResolution = new ColorResolutionCommand( 
      ColorResolutionCommandMode.InPlace, 
      32, 
      RasterByteOrder.Bgr, 
      RasterDitheringMethod.None, 
      ColorResolutionCommandPaletteFlags.None, 
      null); 
   colorResolution.Run(image); 
   Assert.IsTrue(image.BitsPerPixel == 32); 
 
   // Set the alpha values 
   SetAlphaValuesCommand setAlphaValues = new SetAlphaValuesCommand(); 
   setAlphaValues.Alpha = 128; 
   setAlphaValues.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 SetAlphaValuesCommandExample() 
   Dim codecs As RasterCodecs = New RasterCodecs() 
 
   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp") 
   Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "SetAlphaValuesCommand.bmp") 
 
   ' Load the source image from disk 
   Dim image As RasterImage = codecs.Load(srcFileName) 
 
   ' Convert the image to 32-bits/pixel 
   Dim colorResolution As ColorResolutionCommand = New ColorResolutionCommand( 
                                                   ColorResolutionCommandMode.InPlace, 32, 
                                                   RasterByteOrder.Bgr, RasterDitheringMethod.None, 
                                                   ColorResolutionCommandPaletteFlags.None, Nothing) 
   colorResolution.Run(image) 
   Debug.Assert(image.BitsPerPixel = 32) 
 
   ' Set the alpha values 
   Dim setAlphaValues As SetAlphaValuesCommand = New SetAlphaValuesCommand() 
   setAlphaValues.Alpha = 128 
   setAlphaValues.Run(image) 
 
   ' Save the image back to disk 
   codecs.Save(image, destFileName, RasterImageFormat.Bmp, 32) 
 
   ' Clean Up 
   image.Dispose() 
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.Examples; 
using Leadtools.ImageProcessing; 
using Leadtools.Windows.Media; 
 
public void SetAlphaValuesCommandExample(RasterImage image, Stream destStream) 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   // Convert the image to 32-bits/pixel 
   ColorResolutionCommand colorResolution = new ColorResolutionCommand( 
      ColorResolutionCommandMode.InPlace, 
      32, 
      RasterByteOrder.Bgr, 
      RasterDitheringMethod.None, 
      ColorResolutionCommandPaletteFlags.None, 
      null); 
   colorResolution.Run(image); 
   Debug.Assert(image.BitsPerPixel == 32); 
 
   // Set the alpha values 
   SetAlphaValuesCommand setAlphaValues = new SetAlphaValuesCommand(); 
   setAlphaValues.Alpha = 128; 
   setAlphaValues.Run(image); 
 
   // Save the image back to disk 
   codecs.Save(image, destStream, RasterImageFormat.Bmp, 32); 
 
   // Clean Up 
   image.Dispose(); 
} 
vb[Silverlight VB Example] 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.Windows.Media 
 
Public Sub SetAlphaValuesCommandExample(ByVal image As RasterImage, ByVal destStream As Stream) 
   Dim codecs As RasterCodecs = New RasterCodecs() 
 
   ' Convert the image to 32-bits/pixel 
   Dim colorResolution As ColorResolutionCommand = New ColorResolutionCommand(ColorResolutionCommandMode.InPlace, 32, RasterByteOrder.Bgr, RasterDitheringMethod.None, ColorResolutionCommandPaletteFlags.None, Nothing) 
   colorResolution.Run(image) 
   Debug.Assert(image.BitsPerPixel = 32) 
 
   ' Set the alpha values 
   Dim setAlphaValues As SetAlphaValuesCommand = New SetAlphaValuesCommand() 
   setAlphaValues.Alpha = 128 
   setAlphaValues.Run(image) 
 
   ' Save the image back to disk 
   codecs.Save(image, destStream, RasterImageFormat.Bmp, 32) 
 
   ' Clean Up 
   image.Dispose() 
End Sub

Requirements

Target Platforms

Reference

SetAlphaValuesCommand Members

Leadtools.ImageProcessing Namespace

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Help Version 20.0.2020.4.2

Leadtools Assembly

Introduction

Getting Started

Namespaces

Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies