FUJITSU ScanSnap S510 - Manual (Page 110)

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[Compression] tab
■ Compression rate:
Specify a compression rate to control file sizes of scanned images.
By moving the slider, compression rates can be changed.
The compression rate increases as the slider moves to the right.File sizes become
smaller when the compression rate is high.
ATTENTION
When the compression rate is increased, the quality of scanned images
deteriorates.
HINT
• If you select "Color high compression" mode on the [Scanning] tab, the file
size becomes far more smaller by increasing the compression rate.
• In "Color high compression" mode, characters and backgrounds on the
document are compressed separately, and thus, the file size of the document
that mostly contains text characters becomes smaller while the quality of the
characters is kept high. However, this mode is not appropriate for scanning
photographs or figures because these graphical materials are recognized as
background and compressed as such, causing degradation in images. If this
setting is specified, the contrast of the image may become higher.(page 79)
• Depending on the types of documents, file size may increase if you use color
high compression mode than if you do not. The file size of the following types
of documents may become larger.
- Documents containing many pictures and/or graphics but fewer characters
written in black
- Documents of complex layout (e.g. multiple columns)
- Documents with patterned background