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SetAlphaValuesCommand Class

Summary
Fills the image alpha values, while preserving the other image components.
Syntax
C#
VB
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

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
 
 
public void SetAlphaValuesCommandExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "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(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
} 
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:\LEADTOOLS21\Resources\Images" 
End Class 
Requirements

Target Platforms

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