Is [Normal] selected for the image quality level in the scan settings?
Try scanning again after making the image quality level higher in the following procedure:
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On the touch panel of the ScanSnap, select the profile that you are using from the profile list in the home screen.
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Press the arrow at the bottom of the touch panel to display the scan settings.
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Press the image quality icon to change the image quality level.
Example: [Normal] → [Best]
When you scan a document with a profile that is configured to detect a document type automatically, display the scan window of ScanSnap Home on the computer and change the settings.
If you change the scan settings on the touch panel or in the scan window and scan a document, after it is scanned, the scan settings will return back to the settings before any changes were made. If you want to scan documents under the same settings all the time, the scan settings need to be saved as a profile.