DitheringMethod Property

Summary

The dithering options used when converted the image.

Syntax

Objective-C

C++/CLI

Java

Python

public RasterDitheringMethod DitheringMethod { get; set; }

@property (nonatomic, assign) LTRasterDitheringMethod ditheringMethod

public RasterDitheringMethod getDitheringMethod() 
public void setDitheringMethod(RasterDitheringMethod value)

public: 
property RasterDitheringMethod DitheringMethod { 
   RasterDitheringMethod get(); 
   void set (    RasterDitheringMethod ); 
}

DitheringMethod # get and set (ColorResolutionCommand)

Property Value

The dithering option used when converted the image.

Remarks

The dithering method is useful only when the resulting image requires a palette (when it is 8 bits per pixel or less).

Example

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
 
 
public void ColorResolutionCommandExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string destFileName1 = Path.Combine(LEAD_VARS.ImagesDir, "Image1_colorres8.bmp"); 
	string destFileName2 = Path.Combine(LEAD_VARS.ImagesDir, "Image1_colorres4.bmp"); 
 
	// Load the source image from disk 
	RasterImage image = codecs.Load(srcFileName); 
 
	// First color-res it to 8 bits per pixel  using the Netscape palette into a seperate image 
	ColorResolutionCommand cmd = new ColorResolutionCommand(); 
	cmd.Mode = ColorResolutionCommandMode.CreateDestinationImage; 
	cmd.BitsPerPixel = 8; 
	cmd.Order = RasterByteOrder.Rgb; 
	cmd.DitheringMethod = RasterDitheringMethod.None; 
	cmd.PaletteFlags = ColorResolutionCommandPaletteFlags.UsePalette; 
	cmd.SetPalette(RasterPalette.Netscape()); 
	cmd.Run(image); 
 
	RasterImage destImage = cmd.DestinationImage; 
	Assert.IsTrue(destImage.BitsPerPixel == 8); 
 
	// Save it to disk 
	codecs.Save(destImage, destFileName1, RasterImageFormat.Bmp, 8); 
	destImage.Dispose(); 
 
	// Now color-res the image in-place to 4-bits per pixel using the Optimized palette 
	cmd.Mode = ColorResolutionCommandMode.InPlace; 
	cmd.BitsPerPixel = 4; 
	cmd.Order = RasterByteOrder.Rgb; 
	cmd.DitheringMethod = RasterDitheringMethod.None; 
	cmd.PaletteFlags = ColorResolutionCommandPaletteFlags.Optimized; 
	cmd.Run(image); 
	Assert.IsTrue(image.BitsPerPixel == 4); 
 
	// Save it to disk 
	codecs.Save(image, destFileName2, RasterImageFormat.Bmp, 4); 
 
	// Clean Up 
	destImage.Dispose(); 
	image.Dispose(); 
	codecs.Dispose(); 
} 
 
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.*; 
 
 
public void colorResolutionCommandExample() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   RasterCodecs codecs = new RasterCodecs(); 
   String srcFileName = combine(LEAD_VARS_IMAGES_DIR, "rgsref.cmp"); 
   String destFileName1 = combine(LEAD_VARS_IMAGES_DIR, "rgsref_colorres8.bmp"); 
   String destFileName2 = combine(LEAD_VARS_IMAGES_DIR, "rgsref_colorres4.bmp"); 
 
   // Load the source image from disk 
   RasterImage image = codecs.load(srcFileName); 
 
   // First color-res it to 8 bits per pixel using the Netscape palette into a 
   // seperate image 
   ColorResolutionCommand cmd = new ColorResolutionCommand(); 
   cmd.setMode(ColorResolutionCommandMode.CREATE_DESTINATION_IMAGE); 
   cmd.setBitsPerPixel(8); 
   cmd.setOrder(RasterByteOrder.RGB); 
   cmd.setDitheringMethod(RasterDitheringMethod.NONE); 
   cmd.setPaletteFlags(ColorResolutionCommandPaletteFlags.USE_PALETTE.getValue()); 
   cmd.setPalette(RasterPalette.netscape()); 
   cmd.run(image); 
 
   RasterImage destImage = cmd.getDestinationImage(); 
   assertTrue(destImage.getBitsPerPixel() == 8); 
 
   // Save it to disk 
   codecs.save(destImage, destFileName1, RasterImageFormat.BMP, 8); 
 
   assertTrue("file unsuccessfully saved to " + destFileName1, (new File(destFileName1)).exists()); 
   System.out.printf("File saved successfully to %s%n", destFileName1); 
 
   destImage.dispose(); 
 
   // Now color-res the image in-place to 4-bits per pixel using the Optimized 
   // palette 
   cmd.setMode(ColorResolutionCommandMode.IN_PLACE); 
   cmd.setBitsPerPixel(4); 
   cmd.setOrder(RasterByteOrder.RGB); 
   cmd.setDitheringMethod(RasterDitheringMethod.NONE); 
   cmd.setPaletteFlags(ColorResolutionCommandPaletteFlags.OPTIMIZED.getValue()); 
   cmd.run(image); 
   assertTrue(image.getBitsPerPixel() == 4); 
 
   // Save it to disk 
   codecs.save(image, destFileName2, RasterImageFormat.BMP, 4); 
 
   assertTrue("file unsuccessfully saved to " + destFileName1, (new File(destFileName1)).exists()); 
   System.out.printf("File saved successfully to %s%n", destFileName1); 
 
   // Clean Up 
   destImage.dispose(); 
   image.dispose(); 
   codecs.dispose(); 
}