Reproduction Ratio Processing
a) Reproduction Ratio Processing
1 Horizontal Reproduction Ratio (main scanning direction)
When writing image data into memory or reading image data from memory, data units are
when writing (reduction) or are read a number of times when reading (enlargement).
2 Vertical Reproduction Ratio (sub scanning direction)
The scanner is moved at different speeds to change the width of the line, scanning each
pixel
the original.
See Table 3-302 for how the ratios are varied.
as it is and read as it is.
Table 3-302
b) Enlargement Correction Processing
The image data is corrected so that the difference in density between pixels will not vary excessively
when producing enlarged copies.
Figure 3-331 shows image data of an original, image data at time of enlargement, and image data after
enlargement correction.
image density
Image density
Image density
1
pixel
1 pixel
1 pixel
Figure 3-331
1997 CANON INC.
CANON
REV.1 MAY 1997 PRINTED IN JAPAN
AU
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