Invert

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java.lang.Object
- net.sourceforge.jiu.ops.Operation
- - net.sourceforge.jiu.ops.ImageToImageOperation
  - - net.sourceforge.jiu.color.Invert

```
public class Invert
extends ImageToImageOperation
```
Creates an inverted (negated) version of an image. This is done by subtracting each sample value of a channel from the maximum sample for that channel. The maximum sample for a channel is given by IntegerImage.getMaxSample(int). For paletted images, just the palette is treated that way. Supported image types: IntegerImage. Input and output image can be the same object.
Usage
There are two ways of using this class. Either create an Invert object and set all paramters yourself. This lets you reuse image objects or add a progress listener.
```
 Invert invert = new Invert();
 invert.setInputImage(image);
 invert.addProgressListener(listener); // this is optional
 invert.process();
 PixelImage invertedImage = invert.getOutputImage();
 
```
The other method is by sing the static convenience method
```
 PixelImage invertedImage = Invert.invert(someImage);
 
```
You will have to catch the potential exceptions in both cases.
Author:

Marco Schmidt

Constructor Summary

Constructors
Constructor Description

Invert()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static PixelImage`	`invert(PixelImage inputImage)`	Helper method to return an inverted image from the argument image.
`private void`	`prepare(PixelImage in)`
`void`	`process()`	Inverts the input image, reusing an output image if one has been specified.
`private void`	`process(IntegerImage in)`
`private void`	`process(Paletted8Image in)`

Methods inherited from class net.sourceforge.jiu.ops.ImageToImageOperation
canInputAndOutputBeEqual, ensureImagesHaveSameResolution, ensureInputImageIsAvailable, ensureOutputImageResolution, getInputImage, getOutputImage, setCanInputAndOutputBeEqual, setInputImage, setOutputImage

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from class net.sourceforge.jiu.ops.Operation
addProgressListener, addProgressListeners, getAbort, removeProgressListener, setAbort, setProgress, setProgress

- Constructor Detail
  - Invert
```
public Invert()
```
- Method Detail
  - invert
```
public static PixelImage invert(PixelImage inputImage)
                         throws OperationFailedException
```
    Helper method to return an inverted image from the argument image.
    
    Parameters:
    
    inputImage - image to be inverted
    
    Returns:
    
    new image object with inverted image
    
    Throws:
    
    OperationFailedException - on operation errors
  - prepare
```
private void prepare(PixelImage in)
              throws MissingParameterException,
                     WrongParameterException
```
    Throws:
    
    MissingParameterException
    
    WrongParameterException
  - process
```
private void process(Paletted8Image in)
```
  - process
```
private void process(IntegerImage in)
```
  - process
```
public void process()
             throws MissingParameterException,
                    WrongParameterException
```
    Inverts the input image, reusing an output image if one has been specified. For paletted images, inverts the palette. For all other types, subtracts each sample of each channel from the maximum value of that channel.
    
    Overrides:
    
    process in class Operation
    
    Throws:
    
    MissingParameterException - if the input image is missing
    
    WrongParameterException - if any of the specified image parameters are unsupported or of the wrong width or height

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