Brother DS-600 - Manual (Page 42)

Mac OS ® X Operation
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i
Click the “Calibrate” button.
j Insert the black and white calibration sheet with the single arrow on top and the black strip down.
Alternatively, you can use a blank sheet of white paper.
k
Click the “Calibrate” button again.
l
When the calibration scan is complete, click “OK” and then proceed to scan your documents.