Text/Photo, Photo Mode Filter - Ricoh B291 Service Manual

Text/Photo, Photo Mode Filter

SP mode settings listed in Columns 2~4 below adjust the clarity of originals that
contain text, thin lines, and photos; the SP codes of Columns 5~6 are intended to
adjust the clarity of originals with text and thin lines or only photos.
NOTE: The photo mode settings are only valid if SP 4904 001 is set to 1.
Filter Setting:
Mode, Mag.
Edge
Text/Photo
SP4903 39
25 ~ 64%
Text/Photo
SP4903 43
65 ~ 154%
Text/Photo
SP4903 47
155 ~ 256%
Text/Photo
SP4903 51
257 ~ 400%
Photo (Error
SP4903 36
Diffusion)
Ranges 0~7
NOTE: An SP code number and name set in bold italic denotes an SSP (Special
Service Program) mode. To access an SSP, enter the SP mode: press and
hold down " on the 10-key pad then "Copy SP" on the touch-screen.
Filter Setting: Edge (Column 2): Provides filter processing of edges to improve
the clarity of originals that contain text and lines. Selecting a larger value sharpens
the clarity. However, increasing the value also increases the possibility of
producing moiré in the image.
Filter Setting: All (Column 3): Provides filter processing for the overall image, not
to improve just text, lines, or photographs, but to improve the image as a whole.
This filter coefficient reduces the incidence of moiré in images that contain shaded
areas created with dots. Increasing the value improves reproduction of low contrast
text and lines. However, increasing the value also increases the possibility of
producing moiré in the image.
Filter Strength: Edge (Column 4): Aims to increase the strength of the "Filter
Setting: Edge" effect that processes edges to improve the clarity of originals that
contain text and lines. Increasing this setting not only increases the strength of the
effect and creates thicker text characters and lines, but can also cause moiré to
appear in the image. On the other hand, decreasing this setting lessens the effect,
creating thinner characters and lines and also reduces the incidence of moiré.
Filter Adj.: Edge Detection (Column 5): Broadens the range of the effect of the
"Filter Setting Edge" SP. Lowering this setting broadens the range for edge filter
processing and increases clarity. Also, using this SP together with "Filter Adj. Mag."
below can sharpen edges to an extent that an abnormal looking image is created.
SM
CÓPIA NÃO CONTROLADA
Filter
Filter Setting:
Strength:
All
Edge
SP4903 40 SP4903 79
SP4903 44 SP4903 82
SP4903 48 SP4903 85
SP4903 52 SP4903 88
SP4903 38 SP4903 91
0~7 0~3
6-39
CÓPIA NÃO CONTROLADA
IMAGE PROCESSING
Filter Adj.: Filter Adj.:
Edge Det. Mag.
SP4903 80 SP4903 81
SP4903 83 SP4903 84
SP4903 86 SP4903 87
SP4903 89 SP4903 90
SP4903 92 SP4903 93
0~15 0~15
B291/B295/B296/B297