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©
1999 CANON INC. CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4 IMAGE PROCESSING SYSTEM
4-9
F. Half tone density processing
The half tone density processing correction curve changes depending on the follow-
ing:
• The copy density setting on the control panel
• The scanning mode (character, character/photo, photo)
In accordance with the copy density setting on the control panel, there is either a
light image or a dark image curve as shown in Figure 4-307.
Furthermore, when photo mode is selected in the scanning mode, the gradation
characteristics are good, and the curve faithfully reproduces the document’s density as
shown in Figure 4-308.
Figure 4-307 Figure 4-308
G. Binarisation
After the half tone processing has finished, multi-value data are converted into bina-
ry data.
The binarisation technique which the unit uses employs is the error diffusion system.
The data which have been binarised are sent to the DC controller PCB with a
recording resolution of 1200 x 600pdi equivalent.
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