Some dialog windows also have Undo buttons as a
convenience.
This command also uses the standard keyboard
accelerator Ctrl+Z.
Special Considerations for Image Windows
For
Image Windows, Undo has
two options; they can restore the previous state of one
image or the entire image set. When the Image Window
contains an image set, you control the operation using the
(
Process Image Set) button.
With the button pressed, Undo applies to
the entire image set.
With the button released, Undo applies
only to the current image.
Undoing an image set is especially powerful. For
example, you might
register a set of 30 images, then use
Combine Image Set to average them into a single, high
signal-to-noise master image. Upon inspecting the new master image
you might find that the registration was not as good as you had
thought. Since
Combine Image Set places the new image into a new
window, the Image Set that you registered still exists (unless you
closed it). To reverse the registration and try again, be sure
is pressed, then execute Undo
(you can determine the button state by reading the pop-up tooltip
for the button). In this example, Undo would restore all 30 images
to their pre-registered state.