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COPYRIGHT
©
1999 CANON INC. CANON imageRUNNER 600 REV.1 JAN. 2000 PRINTED IN U.S.A.
4-15
CHAPTER 4 IMAGE PROCESSING SYSTEM
G. Binary Processing
The copier performs binary processing for the following:
[1] Print photo mode (dither screen method)
[2] Text, text/photo mode, print photo mode (R-ED, i.e., random error diffusion, method)
1. Dither Screen Method
Image data is subjected to screen processing so that the images may be produced in 256 grada-
tions out of binary data.
Figure 4-305A Conceptual Diagram of the Dither Screen Method
4 pixels
8 pixels
In this area, as many as 16
different density patterns
may be created. As such, an
area consisting of 8 × 4
pixels enables creating of
256 (16 × 16) density
patterns.
The black pixels are
thickened according to
density.
Screens consisting of 106
lines running at 45˚ are
created.