Canon GP405 - Total Processing

COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
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CHAPTER 4 IMAGE FORMATION SYSTEM
C. Total Processing
The total processing block performs the following:
• Enlargement/reduction
• Shift
• Negative/positive reversal
• Image composition enlargement/reduction
• Edge emphasis
• Sharpness
Unlike the existing models, the machine uses different methods for enlargement/reduction and
image composition.
1. Enlargement/Reduction
For the vertical ratio (sub scanning direction), the scanner is moved at different speeds, thereby
changing the scanning width per pixel in relation to an original.
In the case of a ratio lower than 50%, data units are skipped when writing them into memory for
sub scanning direction.