Adjusting the scan settings can help you improve your scan results in most conditions.

The Scan Settings are available on the right-hand side of the Scan Dialog when you are about to take a scan. To take a new scan, start a new project or click Edit > New Scan in the toolbar.

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HDR

This setting controls the camera's exposure range during scanning and is similar to exposure bracketing.

Example

HDR off:

2 exposures:

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3 exposures:

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This scene has very high contrast (black and white) and requires the "3 exposure" setting to capture the entire scene without holes. With 2 exposures, and even more so with HDR off, the scan can not detect some of the darker parts of the scene.

Recommendation

"2 Exposures" is the default and typically provides good results without requiring as much scanning time as "3 exposures" below. Try this setting first, then decide if it should be changed.
"3 Exposures" should be used if your scene has very dark or high contrast materials (like the "It's Lit" poster).
"HDR Off" should only be used if your scene materials have little/no contrast (e.g. an all-white sculpture), and/or you require faster scan times, as no HDR will result in a slightly faster scan.