ColorHalftoneCommand Class

Summary

Shows the effect of using an enlarged halftone screen on each image channel. The filter divides the image into rectangles and replaces each rectangle with circles. Each channel has a separate grid of circles, and has its own angle setting. The size of each circle is proportional to the brightness of the rectangle that it is replacing. This method is available in the Document/Medical toolkits.

Syntax

Objective-C

C++/CLI

Java

Python

public class ColorHalftoneCommand : RasterCommand

@interface LTColorHalftoneCommand : LTRasterCommand

public class ColorHalftoneCommand 
    extends RasterCommand

public ref class ColorHalftoneCommand : public RasterCommand

class ColorHalftoneCommand(RasterCommand):

Remarks

This method 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.
If the image has a region, this method works only on the region. If the image does not have a region, this method works on the entire image.
This method does not support signed data images.
This command does not support 32-bit grayscale images.

Color Halftone Function - Before

Color Halftone Function - After

View additional platform support for this Color Halftone function.

Example

Run the ColorHalftoneCommand on an image.

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Effects; 
 
 
public void ColorHalftoneCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, @"ImageProcessingDemo\Beauty16.jpg"), 16, CodecsLoadByteOrder.BgrOrGray, 1, 1); 
 
 
   // Prepare the command 
   ColorHalftoneCommand command = new ColorHalftoneCommand(); 
   command.MaximumRadius = 15; 
   command.CyanAngle = 10800; 
   command.MagentaAngle = 16200; 
   command.YellowAngle = 9000; 
   command.BlackAngle = 4500; 
   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.ColorHalftoneCommand; 
 
 
public void colorHalftoneCommandExample() { 
   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, "cannon.jpg"), 16, 
         CodecsLoadByteOrder.BGR_OR_GRAY, 1, 1); 
 
   // Prepare the command 
   ColorHalftoneCommand command = new ColorHalftoneCommand(); 
   command.setMaximumRadius(15); 
   command.setCyanAngle(10800); 
   command.setMagentaAngle(16200); 
   command.setYellowAngle(9000); 
   command.setBlackAngle(4500); 
 
   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")); 
}