Restore part of an image to its previously saved version

Do one of the following:

Use the History Brush tool to paint with the selected state or snapshot on the History palette.
Use the Eraser tool with the Erase To History option selected.
Select the area you want to restore, and choose Edit > Fill. For Use, choose History, and click OK.

Note: To restore the image with a snapshot of the initial state of the document, choose History Options from the Palette menu and make sure that the Automatically Create First Snapshot option is selected.

Photoshop

Restore part of an image to its previously saved version

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