Brother MFC-250C Software User's Manual page 49

If you choose Custom as the size, the Custom Document Size dialog box appears.
Enter the Name, Width and Height of the document.
You can choose "mm" or "inch" as the unit for Width and Height.
Note
You can see the actual paper size you chose on the screen.
• Width: shows the width of scanning area.
• Height: shows the height of scanning area.
• Data Size: shows the approximate data size in Bitmap format. The size will vary depending on the type
of file, resolution and number of colors used.
Scanning
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