Is the slider for [Brightness (B & W only)] set to the maximum value for [Light] or [Dark]?
Check the scan 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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Adjust the slider for [Brightness (B & W only)].