Ricoh A250 Service Manual page 71

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Image adjustment (08) in the user tools

There are some software filters for enhancing the desired image qualities of the

selected original mode. These filters are the MTF filter, the smoothing filter, and

independent dot erase.

The MTF filter emphasizes sharpness and is used in Text and Text/Photo modes.

The smoothing filter is used in Photo mode, except for Glossy Photo mode (Glossy

Photo mode is one of the photo modes that can be selected with User Tools -

General Features - 08. Image Adjustment). In Glossy Photo mode, the MTF filter is

Independent dot erase removes unwanted dots from the image.

MTF Filter Adjustment - Text and Text/Photo Modes

When the user selects "Service Mode" for either Text or Text/Photo original type

(User Tools - General Features - 08. Image Adjustment), the MTF filter and

coefficient can be adjusted with SP4-915 and 4-916.

It is difficult to simply explain the relationships between the filter coefficient and

filter strengths. Refer to the following charts to determine how to make the filters

weaker or stronger. A large black dot indicates the default setting.

When the filter is stronger in the sub - scan direction, lines parallel to the feed

direction are emphasized. When the filter is stronger in the main scan direction,

lines at right angles to the feed direction are emphasized. A stronger MTF filter can

make a low ID image visible but moiré may become more visible. Moiré is reduced

using a smoothing filter specially designed for this purpose (see "Smoothing Filter

Adjustment - Text/Photo").

Toner Saving

Photo Priority

Text Priority

Glossy Print

IMAGE PROCESSING

(Service Mode)

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