History Window Components
The History window is where all of the actions you have performed on an image since it was opened will be shown. It consists of a list of actions, and a toolbar for rolling back or forward through the effects of the actions.
History
Every time you perform an action that changes the image, or when you create or modify a selection, it will be reflected in the History Window. If you have undone any actions, they will show up at the bottom with a grey background and may be redone by using the Redo facility. If you perform a new action, any actions that are redo-able will be erased to make way for the new action.
History Window Icons
Rewind (Undo All)
This will undo every action that you have performed. If there are many actions in the list, this may take some time to finish.
Undo
This will undo only the last action you performed.
Redo
This will redo the last action that was undone.
Fast Forward (Redo All)
This will redo all the actions that have been undone.