SetAlphaValuesCommand Class

Summary

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

Syntax

Objective-C

C++/CLI

Java

Python

public class SetAlphaValuesCommand : RasterCommand

@interface LTSetAlphaValuesCommand : LTRasterCommand

public class SetAlphaValuesCommand extends RasterCommand

public ref class SetAlphaValuesCommand : public RasterCommand

class SetAlphaValuesCommand(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; 
 
 
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:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

SetAlphaValuesCommand Members

Leadtools.ImageProcessing Namespace

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Help Version 22.0.2023.5.16

Leadtools Assembly

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Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies