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CHAPTER 2
D. Filter Processing
When converting resolution and scaling, the image quality tends to be reduced. To prevent
the image quality reduction, filter processing is performed according to the resolution. Filter
processing for this scanner includes horizontal scanning interpolation, vertical scanning
interpolation, descreen, and averaging. Table 2-2 shows the resolution for filter processing.
Resolution
Gradation
(dpi)
10-99
101-149
Color
151-299
301-1200
10-149
Grayscale
151-299
301-1200
2 - 14
Horizontal
scanning
interpolation
interpolation
x
x
100
x
x
150
o
x
300
o
x
150
o
o
300
x
o
Table 2-2
©
COPYRIGHT
2000 CANON INC. CANOSCAN FB1210U REV.0 APR. 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
Vertical
scanning
Descreen
x
o
o
o
x
o
o
o
x
o
o
x
x
x
x
o
x
o
x
o
x
x
x
x
Averaging
x
x
x
x
o
x
x
x
x
o
x
x
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