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A-61122/A-61124 March 1999 E-25
Use of the Halftone Removal option lowers the resolution of the
image so it is lower than the scan resolution. The associated loss
in resolution may not be acceptable for all applications. Figures C
and D illustrate the effect of Halftone Removal on the aliasing
patterns.
Figure C
Figure D
Figure C Bars at 10, 50, and 96 lines-per-inch (lpi), scanned
at 200 dpi with Halftone Removal.
Figure D 120 dpi screen, scanned at 200 dpi with Halftone
Removal.
NOTE: 1 lines-per-inch = 2 dots-per-inch.
Image resolution
Resolution is the degree of sharpness of the scanned image, and
is measured using a cone-shaped resolution chart. This type of
chart is less susceptible to skew than traditional microcopy
charts. Resolution is read at the point just before the bars of the
chart either touch or break up on the same horizontal line. Shortly
after they touch, they will start to diverge and fewer bars are
resolved. This is most easily measured using some magnification.
Bars touch horizontally at 205 dots-per-inch.
Resolution is read as 200 dots-per-inch.