Ricoh B286, Service Manual, Page: 524 / 622

Image Processing
B286/B289 6-16 SM
6.3.2 ORIGINAL MODES
Overview
Here is a summary of the seven original modes that the operator can select on the
operation panel before scanning the original.
Mode Function
Drawing
Best reproduction of detailed diagrams, specially for drawings with many
thin lines. When Drawing is selected, the auto density feature (ADS) is
automatically switched on.
Note: This selection can be used to sharpen text.
Text
Best reproduction of text and sharp lines. Text mode does not detect
differences between areas of the page that contain text, graphics, or
photographs; all the page is processed as a text original. When this mode is
selected, the auto image density feature (ADS) is automatically switched
on.
Text/Photo
The 2-level error diffusion used in this mode gives the best reproduction for
originals with text and photos on the same page. Grayscales are more
accurate than those achieved with Text mode. When this mode is selected,
the auto image density feature (ADS) is automatically switched on.
Photo
The 2-value dither processing used in this mode removes jagged edges on
photo originals. Gives the best reproduction for copied photographs. When
this mode is selected, the auto image density feature (ADS) is automatically
switched off.
Background
Lines
Ignores blue or green lines in the original. For example, the blue grid
squares of graph paper, or the markings with a dropout blue pencil do not
appear in copies. When this mode is selected, the auto density feature
(ADS) is automatically switched on.
Note : Some blue or green lines may not drop out if they are very thick or of
high density.
Patched
Original
Prevents background from appearing in copies of originals where the
textures of the backgrounds differ. For example, this mode will even out the
backgrounds and eliminate the shadows and lines on page or sheets