Canon BJC-2100 Series User Manual page 327

3
Once you are satisfied with the adjustment, click the OK button.
Note
To cancel an adjustment you have made, click the Menu button and then
select Undo. Then, select either of the following:
Last
All
Only the function applied immediately before is cancelled. If you
perform editing two or more times, only the function that you
selected most recently is cancelled.
All the applied functions are cleared and the original image is
restored.
Applying Special Effects to an Image
Using the Scanner With Macintosh 327