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1. Before and after background must be similar. Usually these images differ if you adjust exposure after you have already scanned the before background.
2. The background must not be overexposed. Normal background brightness is about 200 of 255 (maximum - 220) in center of 255shot .
3. The background must be uniform. On the pictures below you can see the example of non-uniform background (left) and uniform one (right).

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