Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual page 312

Press 2 on the main keyboard to advance the number of frames specified by the Custom duration setting, and then
4
repeat the previous step.
Note: To move back the Custom number of frames, press 1 on the main keyboard.
If you use a graphics tablet, map the keyboard shortcuts to the buttons on your pen to work more efficiently. Refer to
your tablet's documentation for instructions.
Use the Clone Stamp tool
You can use the Clone Stamp tool to copy pixel values from one place and time and apply them at another place and
time. For example, you can use the Clone Stamp tool to remove wires by copying from a clear patch of sky, or you
can create a herd of cows from one cow in the source footage and offset the copies in time.
The Clone Stamp tool samples the pixels from a source layer and applies the sampled pixel values to a target layer;
the target layer can be the same layer or a different layer in the same composition. If the source layer and target layer
are the same, the Clone Stamp tool samples paint strokes and effects in the source layer, in addition to the layer source
image.
As with all paint tools, you use the Clone Stamp tool in the Layer panel.
If the source layer and target layer are different layers, open each layer in a different viewer. Press Ctrl+Alt+Shift+N
(Windows) or Command+Option+Shift+N (Mac OS) to split and lock the current viewer.
You can identify what result a stroke will have before you make it by using the clone source overlay, a semi-trans-
parent image of the source layer.
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User Guide