Brother DCP-8020 - Manual (Page 121)

HOW TO SCAN USING WINDOWS ® 8 - 4
Pre-Scanning to crop a portion you want to scan
The PreScan button is used to preview an image for cropping any
unwanted areas from the image. When you are satisfied with the
preview, click the Start button in the scanner window to scan the image.
1
Place the original face up in the ADF, or face down on the
scanner glass.
2
Select the settings for Image Type, Resolution, Scan Type,
Brightness and Contrast, as needed.
3
In the Brother DCP-8025D, Brother DCP-8025D USB or
Brother DCP-8025D LAN Scanner Setup dialog box, click the
PreScan button.
The entire original will be scanned into the PC and will appear in
the Scanning Area.
Scanning area
Scanning area