Again, remember that all the shortcuts I mention here assume that you choose Ctrl+Z (Toggles Undo/Redo) from the Redo Key pop-up menu in the Preferences dialog box (the default setting):
* Undo: To restore an image to the way it looked before the last operation, choose Edit ^ Undo (Ctrl+Z). You can undo the effect of a paint or edit tool, a change made to a selection outline, or a special-effect or color-correction command. You can't undo disk operations, such as opening or saving. Photoshop does enable you to undo an edit after printing an image, though. You can test an effect, print the image, and then undo the effect if you think it looks awful.
* Revert: Choose File ^ Revert (or press the F12 key) to reload an image from disk. This is generally the last-resort function, the command you choose after everything else has failed.
Tip To restore the image to the way it looked when you originally opened it —
which may precede the last saved state — scroll to the top of the History palette and click the topmost item. (This assumes that you haven't turned off the Automatically Create First Snapshot check box in the History Options dialog box.)
* Selective reversion: To revert a selected area to the way it appeared when it was first opened — or some other source state identified in the History palette — choose Edit ^ Fill (Shift+Backspace). Then select History from the Use pop up menu and press Enter.
Tip Better yet, just press Ctrl+Alt+Backspace. This one keystroke fills the selec tion with the source state in a jiffy. (You set the source state by clicking in the left column of the History palette, as I explain in the very next section.)
* The erasers: Drag in the background layer with the eraser tool to paint in the background color. You're essentially erasing the image back to bare canvas. Or apply the eraser to a layer to delete pixels and expose underlying layers. For additional erasing flexibility, the magic eraser and background eraser (introduced in Photoshop 5.5) rub away similarly colored pixels and background pixels, respectively.
Tip You can also Alt drag with the eraser to revert to the targeted state in the
History palette. Or select Erase to History in the Options bar and just drag. But you're better off using the history brush for this purpose. The history brush offers more capabilities — notably, brush modes.
Where warranted, I explain these functions in greater detail in the following sections. But first, the next few paragraphs look at the central headquarters for reversion in Photoshop, the History palette.
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