java.lang.Object
- ij.Undo

```
public class Undo
extends java.lang.Object
```
This class consists of static methods and fields that implement ImageJ's Undo command.

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`COMPOUND_FILTER`
`static int`	`COMPOUND_FILTER_DONE`
`static int`	`FILTER`	Undo using ImageProcessor.snapshot.
`static int`	`MACRO`
`static int`	`NOTHING`
`static int`	`OVERLAY_ADDITION`
`static int`	`PASTE`
`static int`	`ROI`
`static int`	`TRANSFORM`	Undo using a single image, or composite color stack, copy (limited to 200MB).
`static int`	`TYPE_CONVERSION`	Undo using an ImageProcessor copy.

Constructor Summary

Constructors
Constructor Description

Undo()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`reset()`
`static void`	`saveOverlay(ImagePlus imp)`
`static void`	`setup(int what, ImagePlus imp)`
`static void`	`undo()`

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

- Field Detail
  - NOTHING
```
public static final int NOTHING
```
    See Also:
    
    Constant Field Values
  - FILTER
```
public static final int FILTER
```
    Undo using ImageProcessor.snapshot.
    
    See Also:
    
    Constant Field Values
  - TYPE_CONVERSION
```
public static final int TYPE_CONVERSION
```
    Undo using an ImageProcessor copy.
    
    See Also:
    
    Constant Field Values
  - PASTE
```
public static final int PASTE
```
    See Also:
    
    Constant Field Values
  - COMPOUND_FILTER
```
public static final int COMPOUND_FILTER
```
    See Also:
    
    Constant Field Values
  - COMPOUND_FILTER_DONE
```
public static final int COMPOUND_FILTER_DONE
```
    See Also:
    
    Constant Field Values
  - TRANSFORM
```
public static final int TRANSFORM
```
    Undo using a single image, or composite color stack, copy (limited to 200MB).
    
    See Also:
    
    Constant Field Values
  - OVERLAY_ADDITION
```
public static final int OVERLAY_ADDITION
```
    See Also:
    
    Constant Field Values
  - ROI
```
public static final int ROI
```
    See Also:
    
    Constant Field Values
  - MACRO
```
public static final int MACRO
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - Undo
```
public Undo()
```
- Method Detail
  - setup
```
public static void setup(int what,
                         ImagePlus imp)
```
  - saveOverlay
```
public static void saveOverlay(ImagePlus imp)
```
  - reset
```
public static void reset()
```
  - undo
```
public static void undo()
```

Class Undo

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

NOTHING

FILTER

TYPE_CONVERSION

PASTE

COMPOUND_FILTER

COMPOUND_FILTER_DONE

TRANSFORM

OVERLAY_ADDITION

ROI

MACRO

Constructor Detail

Undo

Method Detail

setup

saveOverlay

reset

undo