Ricoh B082 Service Manual page 372

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IMAGE PROCESSING

Photo Mode Image Quality

This section describes how to select a setting to improve image quality in the Photo

mode with dithering in order to create an extremely smooth photo image.

Generally, a larger dithering matrix uses rougher dither pattern to reproduce a

smoother gray image, but lowering the resolution can make text and lines more

difficult to see. Conversely, a smaller dithering matrix uses a finer dithering pattern

to reproduce a gray image of rougher texture, but raising the resolution can make

text and lines easier to see.

SP4904 002 Quality Photo Mode

Dither Pattern

8 x 8 (75 lines)

8 x 8 (106 lines)

6 x 6 (142 lines)

4 x 4 (212 lines)

For these dither adjustments to take effect, SP4904 1 (Grayscale Photo Mode)

must be set to "0" to enable dithering.

Here are some general rules:

• If your main concern is reproducing legible text, use the smaller matrixes, but

a smaller matrix could cause spurious lines to appear in images.

• When using the smallest matrix with setting "3" (4 x 4), you should switch off

the smoothing filter for the Photo mode by setting SP4903 37 to "0".

• Use the largest dither matrix (setting "0") for originals that contain dot

screening such as newspaper and magazine photographs.

Processing Priority

Dot screen areas

Filled areas (highest priority)

Filled areas

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