IMAGE PROCESSING
2-35
SM A229
Detailed
Descriptions
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. Image Processing Mode Default Value (SP Setting)
SP4903-28 Text Mode 2
SP4903-30 Text/Photo Mode 9
SP4903-31 Pale Mode 1
SP4903-32 Generation Mode 1
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
Function
SP mode
value
Function
0 Disabled 8 Disabled
1 If A < 16, the central pixel is
deleted (changed to white)
9 If A < 16, the density is
reduced to the average
2 If A < 32, the central pixel is
deleted (changed to white)
10 If A < 32, the density is
reduced to the average
3
If A < 48, the central pixel is
deleted (changed to white)
11
If A < 48, the density is
reduced to the average
4 If A < 64, the central pixel is
deleted (changed to white)
12 If A < 64, the density is
reduced to the average
5 If A < 80, the central pixel is
deleted (changed to white)
13 If A < 80, the density is
reduced to the average
6
If A < 96, the central pixel is
deleted (changed to white)
14
If A < 96, the density is
reduced to the average
7 If A < 128, the central pixel is
deleted (changed to white)
15 If A < 128, the density is
reduced to the average
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