Adobe Photoshop CC 2014 v.14.xx - Manual (Page 120)

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To rename a snapshot, double-click the snapshot and enter a name.
To delete a snapshot, select the snapshot and either choose Delete from the panel menu, click the Delete icon , or drag the snapshot
to the Delete icon.
Paint with a state or snapshot of an image
The History Brush tool lets you paint a copy of one image state or snapshot into the current image window. This tool makes a copy, or sample,
of the image and then paints with it.
For example, you might make a snapshot of a change you made with a painting tool or filter (with the Full Document option selected when you
create the snapshot). After undoing the change to the image, you could use the History Brush tool to apply the change selectively to areas of the
image. Unless you select a merged snapshot, the History Brush tool paints from a layer in the selected state to the same layer in another state.
The History Brush tool copies from one state or snapshot to another, but only at the same location. In Photoshop, you can also paint with the Art
History Brush tool to create special effects.
1. Select the History Brush tool .
2. Do one of the following in the options bar:
Specify the opacity and blending mode.
Choose a brush and set brush options.
3. In the History panel, click the left column of the state or snapshot to be used as the source for the History Brush tool.
4. Drag to paint with the History Brush tool.
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