Canon MX450 series Online Manual page 27

Note
You can add e-mail clients to use for attachments from the pop-up menu.
If None (Attach Manually) is selected, manually attach scanned and saved images to e-mail.
5. Click OK.
The IJ Scan Utility main screen appears.
Note
See the following pages for details on the setting items in the Settings dialog.
Settings (Auto Scan) Dialog
Settings (Photo Scan) Dialog