GrayScaleToDuotoneCommand Class

Summary

Converts the grayscale image into a colored one by mixing or replacing the original values of the pixels with new colors. This class is available in the Imaging and above toolkits.

Syntax

Objective-C

C++/CLI

Java

Python

public class GrayScaleToDuotoneCommand : RasterCommand

@interface LTGrayscaleToDuotoneCommand : LTRasterCommand

public class GrayScaleToDuotoneCommand 
    extends RasterCommand

public ref class GrayScaleToDuotoneCommand : public RasterCommand

class GrayScaleToDuotoneCommand(RasterCommand):

Remarks

This class was designed for use with grayscale images. If the image being used is not grayscale, this method only affects those pixels or areas of the image where Red = Green = Blue.
This class transforms the 8-bit grayscale images into colored 8-bit images (Palette) meanwhile the 12-bit and 16-bit grayscale images are transformed into a 48-bit colored image.
Monotone conversion is possible by setting GrayScaleToDuotoneCommandMixingType to ReplaceOldWithNew, which clears the palette.
This method gives you the option of having the toolkit generate the array of colors to use or creating the array of colors to use yourself.
To have the toolkit generate the array of colors, pass the color to use for generating the array of gradient colors in the Color property.
- If the image is binary, the GrayscaleMode property is used to determine the kind of grayscale palette being used. If the GrayscaleMode property is GrayscaleMode.OrderedInverse or GrayscaleMode.NotOrdered, then the color set in the Color property for the GrayScaleToDuotoneCommand will become the first color in the array generated by the toolkit, NewColor[0], and the toolkit will create the second color in the array NewColor[1]. If the GrayscaleMode property is a value other than GrayscaleMode.OrderedInverse or GrayscaleMode.NotOrdered, then the color set in the Color property for the GrayScaleToDuotoneCommand will become the second color in the array generated by the toolkit, NewColor[1], and the toolkit will create the first color in the array NewColor[0].
- If the image is grayscale (not binary) the GrayScaleToDuotoneCommand will use the color set in the Color property and generate a 256 color gradient in NewColor.
- If the image is not grayscale (it is color) then the GrayScaleToDuotoneCommand will use the color set in the Color property and generate a 256 color gradient in NewColor. These colors will be used to change only those pixels in the color image for which Red = Green = Blue.
To use a user-defined array of colors:
- If the image is binary, call GrayScaleToDuotoneCommand with the two colors you wish to use in the NewColor property.
- If the image is grayscale (not binary) call GrayScaleToDuotoneCommand with the 256 colors you wish to use in the NewColor property.
- If the image is not grayscale (it is color) call GrayScaleToDuotoneCommand with the 256 colors you wish to use in the NewColor property. These colors will be used to change only those pixels in the color image for which Red = Green = Blue.
This class 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 class 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. For more information, refer to Grayscale Images.

Gray Scale to Duotone Function - Before

Gray Scale to Duotone Function - After

View additional platform support for this Gray Scale to Duotone function.

Example

Run the GrayScaleToDuotoneCommand on an image.

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Color; 
 
 
public void GrayScaleToDuotoneCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, @"ImageProcessingDemo\Beauty16.jpg")); 
 
   // Prepare the command 
   GrayScaleToDuotoneCommand command = new GrayScaleToDuotoneCommand(); 
   //Apply duotone conversion. 
   command.Type = GrayScaleToDuotoneCommandMixingType.ReplaceOldWithNew; 
   command.Color = new Leadtools.RasterColor(255, 0, 0); 
   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.color.*; 
 
 
public void grayScaleToDuotoneCommandExample() { 
 
   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, "Beauty16.jpg")); 
 
   // Prepare the command 
   GrayScaleToDuotoneCommand command = new GrayScaleToDuotoneCommand(); 
 
   // Apply duotone conversion. 
   command.setType(GrayScaleToDuotoneCommandMixingType.REPLACE_OLD_WITH_NEW); 
   command.setColor(new RasterColor(255, 0, 0)); 
   command.run(image); 
   codecs.save(image, combine(LEAD_VARS_IMAGES_DIR, "Result.jpg"), RasterImageFormat.JPEG, 24); 
 
   assertTrue(new File(combine(LEAD_VARS_IMAGES_DIR, "Result.jpg")).exists()); 
   System.out.println("Command run and image saved to " + combine(LEAD_VARS_IMAGES_DIR, "Result.jpg")); 
 
}