Avision AV100III - Manual (Page 22)

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Invert: The invert command reverses the brightness and
the color in the image. For color images, each
pixel will be changed into its complementary
color at the command of Invert.
Color Match: Adjusts the color quality of the image so that it
comes close to that of the original. This
function uses default parameters to adjust the
image.
Filter: Gives you special effects on the image. You can
select the Filter function from the menu bar.
Descreen: Eliminates moire patterns commonly found in
printed matter. The Descreen function can be
found in the pull-down Filter menu.