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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Display the scan window of ScanSnap Home on the computer.
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Select the profile that you are using from the profile list.
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Click the image quality level setting icon to change the image quality level.
Example: [Normal] → [Best]
If you change the scan settings in the scan window and scan a document, after it is scanned, the scan settings will return back to the settings before any changes are made. If you want to scan documents under the same settings all the time, the scan settings need to be saved as a profile.