There are two roles.
One is to create a picture you handled (tú piàn) at the scene, such as some point, you''re dealing with images (tú piàn) when feeling super good, worried that the operation would destroy it, you can create a snapshot.In this way, after you no matter what it has been operating, you can quickly return to the situation by clicking snapshot.
One is the history brush to use, click on the snapshot, you can then draw the effect brush with history.For example, you create a snapshot of a picture (tú piàn), then use photo filters, and then select the history brush, select the snapshot for the history brush source, so that the state can begin to draw on the picture (tú piàn).
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