You can undo single or multiple actions as you edit an image. For example, you can undo brushstrokes, color adjustments, or effects that you have applied to the image. You can also redo single or multiple actions to reapply commands that you have undone.

You can also revert to the last saved version of the image.

The History palette lets you undo and redo actions selectively, regardless of their sequence.

Undo and redo controls on the History palette

You can undo multiple actions, as well as specific actions, by using the History palette. The History palette lists all actions performed on the active image. The most recent action is at the top of the list, and the first action performed is at the bottom of the list. Unlike the Undo and Redo commands, the History palette lets you undo or redo actions selectively, regardless of their sequence.

By default, the History palette lists the 250 most recently executed commands on the active image. You can set the Undo preferences and specify a higher or lower number of commands.

The table below lists the Undo/Redo controls on the History palette.

Undo to Here	Undoes the selected action and all subsequent actions. Clicking this button is equivalent to clicking an item’s eye icon. The undone actions are denoted by a blank box .
Redo to Here	Redoes the selected action and all undone actions preceding it. Clicking this button is equivalent to clicking an item’s yellow-X eye icon.
Undo Selected	Undoes a selected action. Clicking this button is equivalent to holding down Ctrl and clicking an item’s eye icon. Note: Undoing a selected action may interfere with subsequent actions and produce unintended results.
Redo Selected	Redoes a selected action. Clicking this button is equivalent to holding down Ctrl and clicking an item’s red-X eye icon.
Clear Selectively Undone Commands	Converts all selectively undone actions into commands that can no longer be undone or redone. You are prompted to confirm the performance of this action.
Show Non-Undoable Commands	Shows or hides the non-undoable commands. When shown, non-undoable items are grayed out.
Empty Command History	Converts all History palette items into non-undoable commands. You are prompted to confirm the performance of this action.

For more information about the History palette, To undo and redo actions by using the History palette.

To undo an action

• Choose Edit Undo.

If you want to undo multiple actions, repeat the Edit Undo command.

The Undo command undoes multiple actions in the order in which they were performed. To undo actions selectively, you can use the History palette.

If the action cannot be undone, the Undo command is unavailable.

You can also undo an action by clicking the Undo button on the Standard toolbar, or by pressing Ctrl + Z.

To redo an action

• Choose Edit Redo.

The Redo command redoes multiple actions in the order in which they were undone. To redo actions selectively, you can use the History palette.

Only actions that have been undone can be redone.

You can also redo an action by clicking the Redo button on the Standard toolbar, or by pressing Ctrl + Alt + Z.

To revert to the last saved version of an image

• Choose File Revert.

To undo and redo actions by using the History palette

To	Do the following
Undo an action	Click the Undo/Redo button for the selected action, or click the Undo to Here button . The undone actions are denoted by a blank box .
Redo an undone action	Click the Undo/Redo button for the selected action, or click the Redo to Here button . The selected action and all preceding actions are redone and no longer appear as blank icons. Note that selectively undone actions (denoted with a gray X) that precede the action you clicked are not redone. These actions can be redone only with the Redo Selected command.
Selectively undo an action	Hold down Ctrl, and click the Undo/Redo button for the selected action, or click the Undo Selected button . Selectively undone actions are denoted by a gray X.
Redo a selectively undone action	Hold down Ctrl, and click the Undo/Redo button for the selected action, or click the Redo Selected button .

To set Undo preferences

1 Choose File Preferences General Program Preferences.

Non-undoable steps cannot be undone or redone. However, they can be reapplied to the current image or to other open images, saved to a Quickscript or to a regular PspScript file, or copied to the Clipboard.