Avision @V2800 - Manual (Page 40)

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Black/White Multi-Level (Gray): Choose “ON” if you wish to make gray
copies or OFF to make a B&W (single-bit) copy.
Choice:
1. Multi-Level (Gray): ON, *OFF
2. File format: *PDF, MTIFF(Multi-page TIFF), TIFF
3. Compression Level: *Low, Medium, High
(If you choose ON from Multi-Level (Gray), the file formats
include PDF, JPEG, TIFF, and MTIFF. If TIFF or MTIFF is selected
as your file format, the compression Level is limited to Raw
only.
If you choose OFF from Multi-Level (Gray), the file formats
include PDF, TIFF, and MTIFF. The compression Level of MTIFF
or TIFF includes G3, G4, and Raw.)
* Factory Default
Explanation of file format:
PDF PDF(Portable Document Format) is a very popular file format
used by Adobe. You can view PDF files using Adobe Acrobat
or Adobe Reader.
TIFF/MTIFF TIFF (The Tagged-Image File Format) is a flexible bitmap
image format supported by virtually all paint, image-editing,
and page-layout applications. Also, virtually all desktop
scanners can produce TIFF images.
JPEG JPEG (Joint Photographic Experts Group) compression
provides the best results with continuous-tone color and the
smallest file size.
The following table gives you an idea of file size v.s. file format
File Format TIFF PDF JPEG
File Size (A4, Color, @200 dpi) 10M 53KB 212KB