AlphaBlendCommand Class

Summary

Combines image data from two images, using a specific opacity value.

Syntax

Objective-C

C++/CLI

Java

Python

public class AlphaBlendCommand : RasterCommand

@interface LTAlphaBlendCommand : LTRasterCommand

public class AlphaBlendCommand 
    extends RasterCommand

public ref class AlphaBlendCommand : public RasterCommand

class AlphaBlendCommand(RasterCommand):

Remarks

The opacity determines how much the affected image will show through the source image. For example, if the Opacity property (or the opacity parameter in the constructor) is set to 255 (completely opaque) then the source image will appear and the affected image will not show through the source image at all. If the opacity is 128 (half opacity), then the pixels for that area will consist of 50 percent from the source image and 50 percent from the affected image.
This command supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.
This command does not support signed data images.
This command does not support 32-bit grayscale images.

For more information, refer to Introduction to Image Processing With LEADTOOLS.

Alpha Blend Function - Before

Alpha Blend Function - After

View additional platform support for this Alpha Blend function.

Example

Run the AlphaBlendCommand on an image.

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Effects; 
 
 
public void AlphaBlendCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg")); 
 
   // Prepare the command 
   RasterImage SrcImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, @"ImageProcessingDemo\Image3.cmp"), 4, CodecsLoadByteOrder.Bgr, 1, 1); 
 
   AlphaBlendCommand command = new AlphaBlendCommand(); 
   //Combine SrcImage with image, with half opacity. 
   command.DestinationRectangle = new LeadRect(image.Width / 8, image.Height / 8, image.Width, image.Height); 
   command.SourceImage = SrcImage; 
   command.Opacity = 128; 
   command.Run(image); 
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24); 
 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

 
import java.io.File; 
import java.io.IOException; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.imageprocessing.effects.AlphaBlendCommand; 
 
 
public void alphaBlendCommandExample() { 
    final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
 
    // Load an image 
    RasterCodecs codecs = new RasterCodecs(); 
    codecs.setThrowExceptionsOnInvalidImages(true); 
    RasterImage image = codecs.load(combine(LEAD_VARS_IMAGES_DIR, "Master.jpg")); 
 
    // Prepare the command 
    RasterImage srcImage = codecs.load(combine(LEAD_VARS_IMAGES_DIR, "Image2.cmp"), 4, CodecsLoadByteOrder.BGR, 1, 
            1); 
    AlphaBlendCommand command = new AlphaBlendCommand(); 
    // Combine SrcImage with image, with half opacity 
    command.setDestinationRectangle( 
            new LeadRect(image.getWidth() / 8, image.getHeight() / 8, image.getWidth(), image.getHeight())); 
    command.setSourceImage(srcImage); 
    command.setOpacity(128); 
 
    int change = command.run(image); 
    assertTrue(change != RasterImageChangedFlags.NONE); 
 
    codecs.save(image, combine(LEAD_VARS_IMAGES_DIR, "Result.jpg"), RasterImageFormat.JPEG, 24); 
    System.out.println("Command run and image saved to: " + combine(LEAD_VARS_IMAGES_DIR, "Result.jpg")); 
}