Adobe photoshop elements User Manual

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ADOBE PHOTOSHOP ELEMENTS
User Guide
For information on how to restore your image to 
how it looked at any point in the current work 
session, see “Reverting to any state of an image” on 
page 33.
To undo the last operation:
Choose Edit > Undo, or click the Step Backward 
button ( ) in the shortcuts bar. 
If an operation can’t be undone, the command is 
dimmed and changes to Can’t Undo.
To redo the last operation:
Choose Edit > Redo, or click the Step Forward 
button ( ) in the shortcuts bar.
To free memory used by the Undo command, the 
History palette, or the Clipboard:
Choose Edit > Purge, and choose the item type or 
buffer you want to clear. If already empty, the item 
type or buffer is dimmed. 
Important: The Purge command permanently 
clears from memory the operation stored by the 
command or buffer; it cannot be undone. Use the 
Purge command when the amount of information 
held in memory is so large that Photoshop Elements’ 
performance is noticeably diminished.
To revert to the last saved version: 
Choose File > Revert.
Note: Revert is added as a history state in the History 
palette and can be undone.
Reverting to any state of an 
image
The History palette lets you jump to any recent 
state of the image created during the current 
working session. Each time you apply a change to 
pixels in an image, the new state of that image is 
added to the palette.
For example, if you select, paint, and rotate part of 
an image, each of those states is listed separately in 
the palette. You can then select any of the states, 
and the image will revert to how it looked when 
that change was first applied. You can then work 
from that state.
Actions that do not affect pixels in the image, such 
as zooming and scrolling, will not appear in the 
History palette.
About the History palette
Note the following guidelines when using the 
History palette:
Program-wide changes, such as changes to 
palettes, color settings, and preferences, are not 
changes to a particular image and so are not added 
to the History palette.
By default, the History palette lists the previous 
20 states. Older states are automatically deleted to 
free more memory for Photoshop Elements. To 
change the number of states that can be displayed 
in the History palette, choose Edit > Preferences > 
General, and enter a number for History States. 
The maximum number of states is 100.
Once you close and reopen the document, 
all states from the last working session are cleared 
from the palette.