SetAlphaValuesCommand Class

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public class SetAlphaValuesCommand : RasterCommand, IRasterCommand

'Declaration
 
Public Class SetAlphaValuesCommand 
   Inherits RasterCommand
   Implements IRasterCommand

'Usage
 
Dim instance As SetAlphaValuesCommand

public sealed class SetAlphaValuesCommand : IRasterCommand

function Leadtools.ImageProcessing.SetAlphaValuesCommand()

public ref class SetAlphaValuesCommand : public RasterCommand, IRasterCommand

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

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

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

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);
      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, destFileName, RasterImageFormat.Bmp, 32);

      // Clean Up
      image.Dispose();
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

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();
            });
            }
        }
    }
}

[TestMethod]
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();
}

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();
}

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

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

SetAlphaValuesCommand Members
Leadtools.ImageProcessing Namespace