Canon S400 User Manual page 430

Click the OK button and then close the Settings dialog box.
3
Place the object to be scanned in the printer and then click the Prescan
4
button. You see the image displayed in the Preview Area.
If you only want to scan part of the object, drag the mouse within the
5
Preview Area to select the part to be scanned. The Selection Box indicates
the area that will be scanned.
Using the Scanner With Macintosh
Scanning an Image
430