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[-]:
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Prevents dark background color from being copied, but light areas on the original may not be copied either.
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[+]:
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You may not be able to completely prevent dark background color from being copied, but light areas on the original are always copied.
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IMPORTANT
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If you adjust the background density by pressing [Adjust] for <Background Density>, the [Auto] setting is canceled. Similarly, if you press [Auto] while making manual adjustments in [Adjust], your adjustments are canceled. The machine automatically adjusts the density to match the background.
The setting for [Adjust] for <Background Density> is invalid when all of the conditions below are met. The setting is reflected in the image displayed for [Preview], but not for the actual scanned image.
The original type is set to Text
The resolution is set to 200 x 100 dpi
To activate [Adjust] for <Background Density>, change the settings.
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