Brother MFC-9420CN - Manual (Page 133)

ControlCenter2 (For Mac OS ® X 10.2.4 or greater)
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9
Scan to File:
In the General tab
You can enter up to a 30 character name in the Name for
Custom field. This name will appear as the button name.
Select the type of scan from the Scan Action field.
In the Settings tab
Select the file format from the File Type pull down list. You
can either send the file to the default My pictures folder or
select your own destination folder by using the Browse
button.
You can also select Resolution, Scan Type, Document
Size, Brightness and Contrast settings.
If you want to specify the destination of the scanned image,
check Show Save As Window.
If you want to scan and then crop a portion of a page after
pre-scanning the document, check Show Scanner Interface
box.