Theme: Automatic depth of field
Q:

explaining the automatic brightness control.

A:

This function is available for transparency scans and it does NOT exist in all SilverFast variants.
What it does: this button activates an optical brightness control in the hardware which shall ensure a well balanced histogram - as far as the orignal allows this - in the scan data. This hard-coded function can be activated or deactivated through SilverFast.

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