Fujitsu fi-6000NS Operator's Manual page 208

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1. On the "Scan Settings" screen, select the [Save] tab.
2. Press the [File Format] button.
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The "File Format" screen appears.
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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, this mode is not appropriate for scanning photographs or
pictures since these graphical materials are recognized as background and
compressed as such, causing degradation in the scanned image. If this setting
is specified, the contrast of the image may become higher.
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Also, if "High Compression for Color PDF" is selected, the file size of certain
documents may be larger compared to the level of compression. The file size
of the following kinds of documents may become larger.
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Documents that contain many pictures and/or graphics but fewer
characters written in black
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Documents of complex layout (e.g. multiple columns)
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Documents which have a background pattern behind characters
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When scanning documents with many characters at a 300dpi resolution,
selecting PDF format can reduce the file size.
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If PDF format is selected, Adobe® Acrobat® Reader 4.0 or later is required to
view the created PDF.