InvertCommand Class

Summary

Inverts the colors in the specified image, giving it the appearance of a photographic negative.

Syntax

Objective-C

C++/CLI

Java

Python

public class InvertCommand : RasterCommand

@interface LTInvertCommand : LTRasterCommand

public class InvertCommand 
    extends RasterCommand

public ref class InvertCommand : public RasterCommand

class InvertCommand(RasterCommand):

Remarks

This class can also be used to invert the color of a 1-bit image, making the black white and the white black.
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 command does not support 32-bit grayscale images.
This command supports signed data images.

This command changes the image data. If the image has a LUT, the command will work on the LUT not the image data. If the image has a LUT and you want to work on the image data, first disable the use of the LUT by setting the UseLookupTable Property to FALSE. After you are finished applying the command, restore the use of the LUT by setting the UseLookupTable Property to TRUE again. See the following snippet:

image.UseLookupTable = FALSE; 
InvertCmd.Run(image); 
image.UseLookupTable = TRUE;

For more information, refer to Correcting Colors.

Invert Function - Before

Invert Function - After

View additional platform support for this Invert function.

Example

Run the InvertCommand on an image.

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Color; 
 
 
public void InvertCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "RGSRef.cmp")); 
 
   // Prepare the command 
   InvertCommand command = new InvertCommand(); 
   //Invert the colors of the image. 
   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.InvertCommand; 
 
 
public void invertCommandExample() { 
 
   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, "RGSRef.cmp")); 
 
   // Prepare the command 
   InvertCommand command = new InvertCommand(); 
   // Invert the colors of the image. 
   command.run(image); 
   codecs.save(image, combine(LEAD_VARS_IMAGES_DIR, "Result.jpg"), RasterImageFormat.JPEG, 24); 
 
   System.out.println("Inverted image saved successfully to " + combine(LEAD_VARS_IMAGES_DIR, "Result.jpg")); 
   assertTrue(new File(combine(LEAD_VARS_IMAGES_DIR, "Result.jpg")).exists()); 
 
}