Fujitsu S510 Operator's Guide - Page 110

[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 90 • 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