Canon GP200 Service Manual page 89

2. Total Processing
The total processing block deals with the fol-
lowing:
• Reproduction ratio
• Shift
• Mirror image
• Slanting
• Repeat
• Folding
a. Reproduction Ratio
q Horizontal Reproduction Ratio (main scan-
ning direction)
When writing image data into memory, data
units may be skipped for reduction; when
reading them from memory, they are read a
multiple number of times (enlargement).
Original
(image data)
(writing)
Line memory
(reading)
Copy
Reproduction
ratio in main
scanning direc-
tion
Reproduction
ratio in sub scan-
ning direction
COPYRIGHT © 1996 CANON INC.
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Direct
All data is written as it is
into memory.
Table 3-302
CANON GP215/200 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
w Vertical Reproduction Ratio (sub scanning
direction)
The speed at which the scanner is moved is
varied so as to change the width of scanning
an original.
Table 3-302 gives an idea of how the
GP215/GP200 processes reproduction ratios.
e Zoom Fine-Adjustment
You can adjust the vertical or the horizontal
reproduction ratio using zoom adjustment in
user mode (in 0.1% increments).
For instance, for 'adjustment width' +1% (both
X and Y),
50% 51%
100% 101%
400% 401%
Reduce
To reduce to 1/2, every
other data unit is
skipped when writing
into memory.
The speed at which the
scanner is moved is
increased, thereby
increasing the width of
scanning the original in
relation to a single pixel.
3. OPERATIONS AND TIMING
Enlarge
To enlarge to 200%, all
data units are written as
they are but read twice
when reading from
memory.
The speed at which the
scanner is moved is
decreased, thereby
decreasing the width of
scanning the original in
relation to a single pixel.
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