Fujitsu ScanSnap N1800 Operator's Manual page 311

HINT
When PDF format is selected, select whether or not to use [High Compression for Color PDF]
mode. When [High Compression for Color PDF] is selected, characters and backgrounds are
separated and only backgrounds are compressed. Therefore, the file size of a character
based document can be reduced without the quality of the characters being decreased.
However, note the following:
Photographs or pictures are recognized as background and compressed at a high rate,
causing degradation in the scanned image.
Thus, this mode is not appropriate for scanning photographs or other graphical materials.
The contrast of the image may become higher.
1. On the [Scan Settings] window, select the [Save] tab.
2. Press the [File Format] button.
The [File Format] window appears.
3. Select a file format.
HINT
If PDF format is selected, Adobe Reader 4.0 or later is required to view the created
PDF file.
This returns you to the [Scan Settings] window. The selected format is displayed
to the right of the [File Format] button.
6.9 Setting the Scan Options
311