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Work with the History panel
You can use the History panel to jump
to any recent state of the image created during the current working
session. Each time you apply a change to an image, the new state
of that image is added to the panel.
For example, if you select,
paint, and rotate part of an image, each of those states is listed
separately in the panel. When you select one of the states, the
image reverts to how it looked when that change was first applied.
You can then work from that state.
You can also use the History
panel to delete image states and, in Photoshop, to create a document
from a state or snapshot.
To display the History panel, choose
Window > History, or click the History panel tab.
 Photoshop History panel - A.
- Sets the source for the history brush
- B.
- Thumbnail
of a snapshot
- C.
- History state
- D.
- History state
slider
Keep
the following in mind when using the History panel:
Program-wide changes, such as changes to panels, color settings,
actions, and preferences, are not reflected in the History panel,
because they are not changes to a particular image.
By default,
the History panel lists the previous 20 states. You can
change the number of remembered states by setting a preference.
Older states are automatically deleted to free more memory for Photoshop.
To keep a particular state throughout your work session, make a
snapshot of the state.
Once you
close and reopen the document, all states and snapshots from the last
working session are cleared from the panel.
By default, a snapshot of the initial state of the document
is displayed at the top of the panel.
States are added to the bottom of the list. That is, the
oldest state is at the top of the list, the most recent one at the
bottom.
Each state is listed with the name of the tool or command
used to change the image.
By default, when you select a state, the states below it
are dimmed. This way you can easily see which changes will be discarded
if you continue working from the selected state.
By default, selecting a state and then changing the image
eliminates all states that come after it.
If you select a state and then change the image, eliminating
the states that came after, you can use the Undo command to undo
the last change and restore the eliminated states.
By default, deleting a state deletes that state and those
that came after it. If you choose the Allow Non-Linear History option,
deleting a state deletes only that state.
Revert to a previous image state Do any of the following:
Delete one or more image states Do
one of the following:Click the name of the state, and choose
Delete from the History panel menu to delete that change and those
that came after it.
Drag the state to the Delete icon  to
delete that change and those that came after it.
Choose Clear History from the panel menu to delete
the list of states from the History panel, 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 panel menu to purge the list of
states without changing the image. If you get a message
that Photoshop is low on memory, purging states is useful, because
the command deletes the states from the Undo buffer and frees up memory.
You can’t undo the Clear History command.
Choose Edit > Purge > Histories
to purge the list of states for all open documents. You can’t undo
this action.
Create or replace a document with an image state Do one of the following:Drag a state or snapshot onto the Create
a New Document From Current State button  in
the History panel. The history list for the newly created document
will be empty.
Select a state or snapshot, and click the Create
a New Document From Current State button . The
history list for the newly created document will be empty.
Select a state or snapshot, and choose New Document
from the History panel menu. The history list for the newly created
document will be empty.
Drag a state onto an existing document.
 To save one or more snapshots or image
states for use in a later editing session, create a new file for
each state you save, and save each in a separate file. When you reopen
your original file, plan to open the other saved files also. You
can drag each file’s initial snapshot to the original image to access
the snapshots again from the original image’s History panel.
Set history optionsYou can specify the maximum number of items
to include in the History panel and set other options to customize
the panel.
- Choose
History Options from the History panel menu.
- Select an option:
- Automatically Create
First Snapshot
- Automatically creates a snapshot of the initial state
of the image when the document is opened.
- Automatically Create New Snapshot When Saving
- Generates a snapshot every time you save.
- Allow Non-Linear History
- Makes changes to a selected state without deleting the
states that come after. Normally, when you select a state and change
the image, all states that come after the selected one are deleted.
In this way, the History panel can display a list of the editing
steps in the order that they were made. By recording states in a
nonlinear way, you can select a state, make a change to the image,
and delete just that state. The change is appended at the end of
the list.
- Show New Snapshot Dialog By Default
- Forces Photoshop to prompt you for snapshot names even
when you use the buttons on the panel.
- Make Layer Visibility Changes Undoable
- By default, turning layer visibility on or off is not
recorded as a history step and therefore can’t be undone. Select
this option to include layer visibility changes in history steps.
Set Edit History Log optionsYou may need to keep careful track of what’s
been done to a file in Photoshop, either for your own records, client
records, or legal purposes. The Edit History Log helps you keep
a textual history of changes made to an image. You can view the Edit
History Log metadata using Adobe Bridge or the File Info dialog
box.
You can choose to export the text to an external log
file, or you can store the information in the metadata of edited
files. Storing many editing operations as file metadata increases
file size; such files may take longer than usual to open and save.
If you need to prove that the log file hasn’t been
tampered with, keep the edit log in the file’s metadata, and then
use Adobe Acrobat to digitally sign the log file. By default,
history log data about each session is saved as metadata embedded in
the image file. You can specify where the history log data is saved
and the level of detail contained in the history log.
- Choose Edit > Preferences >
General (Windows) or Photoshop > Preferences > General
(Mac OS).
- Click the History Log preference to toggle from on to
off or vice versa.
- For the Save Log Items To option, choose one of the following:
- Metadata
- Saves the history log as metadata embedded in each file.
- Text File
- Exports the history log to a text file. You are prompted
to name the text file and choose a location in which to store it.
- Both
- Stores metadata in the file and creates a text file.
Note: If you want to save the text file in a different
location or save another text file, click the Choose button, specify
where to save the text file, name the file if necessary, and click
Save.
- From the Edit Log Items menu, choose one of the following
options:
- Sessions Only
- Keeps a record of each time your start or quit Photoshop
and each time you open and close files (each image’s filename is
included). Does not include any information about edits made to
the file.
- Concise
- Includes the text that appears in the History panel in
addition to the Sessions information.
- Detailed
- Includes the text that appears in the Actions panel in
addition to the Concise information. If you need a complete history
of all changes made to files, choose Detailed.
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