Operating Modes
3-1
3. Operating Modes
The MAGNUM Color Scanners work in six basic operating modes:
•
24 bit RGB color mode
•
8-bit indexed color mode
•
8-bit feature extraction color mode
•
Graytone mode (256 graytones)
•
B/W modes (bitmapped, 2-level and 2D-adaptive)
•
B/W Copy modes with Dual 2D-Adaptive processing.
3.1 RGB mode
Full 24-bit true color mode for 16.8 million colors.
3.2 Indexed color mode
An effective method for scanning documents that display a limited
range of colors, is to map true colors to a selected color palette. The
palette is automatically generated by an adaptive color optimizing pre-
scan of the original.
The scanner on-board color transformation to a 16- or 256-color
palette greatly reduces the data volume, increases scan speed and
minimizes disk storage requirements by only requiring 4-bit or 8-bit per
color pixel (compared with 24-bit in true color mode).
3.3 Feature extraction (classified) color mode
Real-time color classification mode sorts the observed color features
in the document into a set of color categories by on-board mapping
through a classified color LUT (Look Up Table). The classified color
LUT is generated by the user through the tools in WIDEimage and
then downloaded into the scanner. The user only has to create the
LUT once for a whole class of documents.
The scanner on-board color mapping through a 256 classified color
LUT greatly enhances clarity and quality of duplicated, faded or printed
(color dithered) documents. It improves details in complex maps or
drawings, increases scanning speed, and minimizes disk storage
requirements.
