Photoshop CS Savvy
You can change the behavior of the history by selecting options in the History Options dialog box. In the History Palette pull-down menu, choose History Options to view or change these settings (see Figure 11.3):
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Automatically Create First Snapshot produces a snapshot of the original image upon opening it and places its thumbnail at the top of the History palette (see the next section, Working with Snapshots ).
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Automatically Create New Snapshot When Saving generates a snapshot of the current state when saving and adds its thumbnail to the top of the History palette.
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Allow Non-Linear History enables you to discard or edit a previous History state without deleting more recent states.
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Show New Snapshot Dialog By Default automatically displays the Snapshot dialog box when a new snapshot is created, prompting you to name the snapshots as they are made.