Have you selected [Automatic] for the color mode in the scan settings?
The problem may solved if you select [Color], [Gray], or [B & W] for the color mode in the scan settings according to the color of a document to be scanned, and perform a scan.
Change the setting 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 color mode setting icon to change the color mode.
If you change the scan settings on the touch panel 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.
Have you selected the [Increase text contrast] checkbox in the scan settings?
The problem may improve if you clear the [Increase text contrast] checkbox in the scan settings and scan the document.
If necessary, change the setting 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 [Edit profiles] button to display the [Edit profiles] window.
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Click the [Detailed settings] button in [Scan settings] to display the [Detailed settings] window.
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Click the [Option] button in the [Scan] tab to display the [Scanning options] window.
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Clear the [Increase text contrast] checkbox.
Is the computer in high contrast mode?
The ScanSnap does not support high contrast mode.