Ricoh SP5 Series Service Manual page 60

June 30, 1998
The threshold level for deciding whether a dot is independent can be changed
using SP mode. The default value of this threshold level is different for each image
processing mode. As shown below, in Text/Photo mode, independent dots are
reduced, but in Text, Pale, or Generation mode, they are erased.
SP Mode No.
SP4903-28
SP4903-30
SP4903-31
SP4903-32
NOTE: Settings 0 and 8: Disable this function.
Settings 1 to 7: Erase detected independent dots
Settings 9 to 15: Reduce the density of detected independent dots
Each SP mode has 16 possible settings, as follows.
(A = Surrounding pixel with the highest value)
SP mode
value
0 Disabled
1 If A < 16, the central pixel is
deleted (changed to white)
2 If A < 32, the central pixel is
deleted (changed to white)
3 If A < 48, the central pixel is
deleted (changed to white)
If A < 64, the central pixel is
4
deleted (changed to white)
5 If A < 80, the central pixel is
deleted (changed to white)
6 If A < 96, the central pixel is
deleted (changed to white)
7 If A < 128, the central pixel is
deleted (changed to white)
Image Processing Mode
Text Mode
Text/Photo Mode
Pale Mode
Generation Mode
Function
2-35
IMAGE PROCESSING
Default Value (SP Setting)
2
9
1
1
SP mode
value
8 Disabled
9 If A < 16, the density is
reduced to the average
10 If A < 32, the density is
reduced to the average
11 If A < 48, the density is
reduced to the average
If A < 64, the density is
12
reduced to the average
13 If A < 80, the density is
reduced to the average
14 If A < 96, the density is
reduced to the average
15 If A < 128, the density is
reduced to the average
Function