What Is A Snapshot On Photoshop

This chapter is from the book 

Making snapshots of history states

A snapshot is like a copy of a history country, with ane major difference: Unlike a state, a snapshot remains on the panel for the current editing session, even if y'all delete the state from which it was created. You can click a snapshot thumbnail at whatsoever time to restore your certificate to that stage of editing. Accept note: All snapshots (and states) are deleted when you shut your document.

You lot should get in the addiction of creating snapshots periodically as you work, and certainly before running any actions on your document. To create snapshots manually, follow one of the methods below. In Method 2, you'll be able to choose whether the snapshot will be made from the total document, from merged layers, or from just the current layer.

To create a snapshot of a state: Method 1 (without choosing options)

On the History panel, click the state that you want to create a snapshot of.
If the Show New Snapshot Dialog past Default option is off in the History Options dialog, click the New Snapshot button at the bottom of the History console. If the aforementioned dialog option is on, Alt-click/Choice-click the New Snapshot button. A new snapshot thumbnail volition appear beneath the concluding snapshot in the upper department of the console. A Click the terminal state on the console to resume editing.

Method 2 (choosing options)

Optional: To create a snapshot of a layer, click that layer on the Layers panel.
Correct-click/Control-click a history state and choose New Snapshot. The New Snapshot dialog opens.
Blazon a Name for the snapshot.
Choose a From pick:
- Total Document creates a snapshot from all the layers on the Layers panel and is useful if you desire to preserve all the edits at a particular stage of your document.
- Merged Layers merges all the visible layers on the Layers panel at that state into the snapshot.
- Current Layer makes a snapshot from only the currently selected layer in its electric current editing state.
Click OK.

To brand a snapshot go the current state:

Click a snapshot thumbnail. If the Allow NonLinear History option is off and you edited the certificate later taking that snapshot, the document will revert to the snapshot stage of editing and all the states will be dimmed; when you resume editing, all dimmed states volition exist discarded. If Allow Non-Linear History is on and y'all resume editing, subsequent states remain on the panel.

Source: https://www.peachpit.com/articles/article.aspx?p=1377268&seqNum=16

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