Ricoh B079 Service Manual page 258

SERVICE PROGRAM MODE TABLES
SP4 Mode Number
4903* 90* Filter Adj.: Text/Photo
(Mag.%) 257-400%
91* Filter Strength: Photo (Edge)
92* Filter Adj.: Photo (Edge Det.)
B079/B082
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Function and [Setting]
Adjusts the filter coefficient magnification setting
selected with SP4903 051 to adjust the clarity of
edges of images copied in the Text/Photo mode
and enlarged in the range 257% to 400%.
•
Specifically, this settings affects how edges
are detected at sharp edges and at faint
borders where no edges exist. A lower setting
reproduces a noticeable difference in the
appearance of sharp and faint borders, and a
higher setting reduces this effect.
• While selecting a lower setting makes it
*easier to distinguish the differences between
sharp and faint borders, this can also cause
moiré to appear in the image. A higher setting
can weaken the clarity of edges.
[0~15 / 12 / 1]
( 6.2 Image Processing)
!
Adjusts the strength of the MTF filter selected with
SP4903 036 that adjusts the edge clarity of
images scanned in the Photo mode. While
selecting a higher setting can improve the clarity
of text and lines, selecting a very high setting can
increase the incidence of moiré.
[0~3 / 2 / 1]
0: Weakest
3: Strongest
( 6.2 Image Processing)
!
Selects the MTF filter coefficient of the edge
detection level of the filter setting selected with
SP4903 036 to adjust the clarity of edges in
images copied in the Photo mode. A lower setting
increases the number of edges detected, and a
higher setting decreases the number of edges
detected.
•
A higher setting affects the density of lines
with a steep slope and to a lesser degree
affects the density of gently sloping lines.
•
Areas other than sloping lines are not affected
by this adjustment.
•
If edge detection is set high, then the range of
edge detection is expanded to include any
background.
[0~15 / 0 / 1]
0: Fewest edges detected. Settings near zero
increase the range of the SP4903 036 setting.
15: Most edges detected. Settings near 15
decrease the range of the SP3903 036 setting.
( 6.2 Image Processing)
!
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