Ricoh VT3500, Service Manual

Page: 152 / 330

In this model, the errors are distributed in three dimensions. The error is
preferentially distributed to darker pixels in higher ratio and to lighter pixels in
lower ratio. CAPIX has the following advantages:
1. Moire patterns are not produced (as in the binary process of the line
mode) since here the differences of the binary process are scattered.
2. With CAPIX both half-tone and solid images are well reproduced, but with
dithering, solid images do not come out as well. This is because dithering
uses more graduation steps than a solid image (such as a simple
diagram or a character) will need.
3. Because of CAPIX’s high resolving power, the texture pattern does not
appear. (With dithering, it does appear.)
255
128
Input
Level
[Print]
Threshold
Level
(Pixel)
0: White Pixel
255: Black Pixel
1 2 3 4 5
6 8
7
[Image Data]
1 pixel
30
35
40
45
20
37
84
65
70
115
100
95
50
80
58
168
170
176
155
165
144
145
150
136
1 December 1993
2-116