You can use the History palette to revert to a previous state
of an image, to delete an image's states, and in Photoshop,
to create a document from a state or snapshot.
Photoshop History palette A. Sets the source for the history
brush B. Thumbnail of a snapshot C. History state D. History
state slider
To display the History palette:
Choose Window > History, or click the History palette tab.
To revert to a previous state of an image:
Do any of the following:
- Click the name of the state.
- Drag the slider
at the left of the state up or down to a different state.
- (Photoshop) Choose Step Forward or Step Backward from
the palette menu or the Edit menu to move to the next
or previous state.
To delete one or more states of the image (Photoshop):
Do one of the following:
- Click the name of the state, and choose Delete from
the History palette menu to delete that change and those
that came after it.
- Drag the state to the Trash button
to delete that change and those that came after it.
- Choose Clear History from the palette menu to delete
the list of states from the History palette, without changing
the image. This option doesn't reduce the amount of memory
used by Photoshop.
- Hold down Alt (Windows) or Option (Mac OS), and
choose Clear History from the palette menu to purge the
list of states from the History palette without changing
the image. If you get a message that Photoshop is
low on memory, purging states is useful, since the command
deletes the states from the Undo buffer and frees up memory.
Important: This action cannot be
undone.
- Choose Edit > Purge > Histories to purge the list
of states from the History palette for all open documents.
Important: This action cannot be undone.
To delete all of an image's states (ImageReady):
Choose Clear Undo/Redo History from the History palette
menu.
Important: This action cannot be undone.
To create a new document from the selected state or snapshot
of the image (Photoshop):
Do one of the following:
- Drag a state or snapshot onto the New Document button
 .
- Select a state or snapshot, and click the New Document
button.
- Select a state or snapshot, and choose New Document
from the History palette menu.
The history list for the newly created document will be
empty.
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