Adobe Photoshop CC 2014 v.14.xx - Manual (Page 119)

Concise
Detailed
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Note:
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Merged Layers
Current Layer
Includes the text that appears in the History panel in addition to the Sessions information.
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.
Make a snapshot of an image
The Snapshot command lets you make a temporary copy (or snapshot) of any state of the image. The new snapshot is added to the list of
snapshots at the top of the History panel. Selecting a snapshot lets you work from that version of the image.
Snapshots are similar to the states listed in the History panel, but they offer additional advantages:
You can name a snapshot to make it easy to identify.
Snapshots can be stored for an entire work session.
You can compare effects easily. For example, you can take a snapshot before and after applying a filter. Then select the first snapshot, and
try the same filter with different settings. Switch between the snapshots to find the settings you like best.
With snapshots, you can recover your work easily. When you experiment with a complex technique or apply an action, take a snapshot first. If
you’re not satisfied with the results, you can select the snapshot to undo all the steps.
Snapshots are not saved with the image—closing an image deletes its snapshots. Also, unless you select the Allow Non-Linear History
option, selecting a snapshot and changing the image deletes all of the states currently listed in the History panel.
Create a snapshot
1. Select a state and do one of the following:
To automatically create a snapshot, click the Create New Snapshot button on the History panel, or if Automatically Create New
Snapshot When Saving is selected in the history options, choose New Snapshot from the History panel menu.
To set options when creating a snapshot, choose New Snapshot from the History panel menu, or Alt-click (Windows) or Option-click
(Mac OS) the Create New Snapshot button.
2. Enter the name of the Snapshot in the Name text box.
3. Choose the snapshot contents from the From menu:
Makes a snapshot of all layers in the image at that state
Makes a snapshot that merges all layers in the image at that state
Makes a snapshot of only the currently selected layer at that state
Work with snapshots
Do one of the following:
To select a snapshot, click the name of the snapshot or drag the slider at the left of the snapshot up or down to a different snapshot.
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