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LEADTOOLS (Leadtools assembly)
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SetAlphaValuesCommand Class








Members 
Leadtools.ImageProcessing Namespace : SetAlphaValuesCommand Class
Fills the image alpha values, while preserving the other image components.
Object Model
Syntax
public class SetAlphaValuesCommand : RasterCommand, IRasterCommand  
'Declaration
 

Public Class SetAlphaValuesCommand 
   Inherits RasterCommand
   Implements IRasterCommand 
'Usage
 

Dim instance As SetAlphaValuesCommand
public sealed class SetAlphaValuesCommand : IRasterCommand  
@interface LTSetAlphaValuesCommand : LTRasterCommand
public class SetAlphaValuesCommand extends RasterCommand
function Leadtools.ImageProcessing.SetAlphaValuesCommand()
public ref class SetAlphaValuesCommand : public RasterCommand, IRasterCommand
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

Copy Code   
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
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;

      
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();
}
RasterCommandExamples.prototype.SetAlphaValuesCommandExample = function () {
    Tools.SetLicense();
    with (Leadtools) {
        with (Leadtools.Codecs) {
            with (Leadtools.ImageProcessing) {
                var codecs = new RasterCodecs();

                var srcFileName = "Assets\\Image1.cmp";
                var destFileName = "SetAlphaValuesCommand.bmp";
                var image;
                // Load the source image from disk
                return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) {
                    return codecs.loadAsync(LeadStreamFactory.create(loadFile))
                })
            .then(function (img) {
                image = img;

                // Convert the image to 32-bits/pixel
                var colorResolution = new ColorResolutionCommand(
                   ColorResolutionCommandMode.inPlace,
                   32,
                   RasterByteOrder.bgr,
                   RasterDitheringMethod.none,
                   ColorResolutionCommandPaletteFlags.none,
                   null);
                colorResolution.run(image);
                console.assert(image.bitsPerPixel === 32, "image.bitsPerPixel == 32");

                // Set the alpha values
                setAlphaValues = new SetAlphaValuesCommand();
                setAlphaValues.alpha = 128;
                setAlphaValues.run(image);
                
                // Save the image back to disk
                return Tools.AppLocalFolder().createFileAsync(destFileName)})
                .then ( function ( saveFile ) {
                return codecs.saveAsync(image, LeadStreamFactory.create(saveFile), RasterImageFormat.bmp, 32)
            })
            .then(function () {
                // Clean Up
                image.close();
            });
            }
        }
    }
}
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;

      
public async Task SetAlphaValuesCommandExample()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = @"Assets\Image1.cmp";
   string destFileName = @"SetAlphaValuesCommand.bmp";

   // Load the source image from disk
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));

   // 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
   StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(destFileName);
   await codecs.SaveAsync(image, LeadStreamFactory.Create(saveFile), RasterImageFormat.Bmp, 32);

   // Clean Up
   image.Dispose();
}
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();
}
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

See Also

Reference

SetAlphaValuesCommand Members
Leadtools.ImageProcessing Namespace

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