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The
easiest way to restore an earlier stage is the History palette in the
lower right corner of the screen. Click the History tab to activate
it and to display all the changes you have made to your current photo.
If you cannot see the palette, click Window/History to show it.The
History palette displays the stages of your picture in steps.
All steps bear the name of the event that produced them. For example,
clicking the Unsharp Mask step restores the picture into the state resulting
from the Unsharp Mask filter action. That is, the sharpening will be
visible in the image, but not the actions that followed. If you carry
out a new command after stepping back, it will take the next step on
the palette, and all the following steps in the queue will disappear.
Let's
see an example. We've done some sharpening on the photo, then
created a Levels correction layer, and finally merged the two
layers. You can see the queue for this sequence above. Looking back,
we are not satisfied with the results of the correction layer (Levels
1 Layer), so we step back to the Unsharp Mask stage. Now
we issue a new command, say, Curves. The steps Levels 1
Layer and Flatten Image disappear from the queue and we cannot
return to them. The Curves command takes over their place as
the last step after Unsharp mask.
The
Open stage restores the original state of the picture just after
loading it.
The
History palette stores the last 20 steps by default. All brush
strokes and any clicks resulting in changes are counted as steps, so
a complex retouching action may even consist of hundreds of steps. If
you want to store more steps in the queue, you can set the desired value
under Edit/Preferences/General. You can store several hundred
steps, but such high values consume an awful amount of memory.
The
next Undo tip will introduce an unbelievably simple and very
underrated menu command.
Related
articles:
Free
Photoshop Tutorial: Undo II.
Free
Photoshop Tutorial: Undo III.
More Photoshop Tutorials
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