Fujitsu ScanSnap N1800 Operator's Manual page 368

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 on the document are compressed separately. In order to do this,
the file size of the document that mostly consists of text characters becomes smaller
while keeping the quality of the characters as they are.
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.
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
368