Genius COLORPAGE VIEW PRO, Руководство пользователя

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11
Descreen
Descreen filter is used to eliminate the moire patterns (wavelike lines) from
the images. As the images are scanned directly from screen-print media (like
newspapers or magazines), you should notice that the scanned images usually
come with wavelike patterns and banding lines. As long as the scanning
resolution is not set very high, you can apply this function to remove those
annoying effects. (When this function is activated, the scanning speed will
become slow.)
Gamma
Sometimes you wish to adjust the brightness of midtones of the scanned image
while keeping shadow and highlight areas relatively unchanged. The Gamma
correction function allows you to increase or decrease the intensity of the
middle gray tones.
The available gamma value
ranges from 0.01 to 7.99. The
default value is 1.0. Changing
the gamma value above 1.0 will
brighten the midtones, while
below 1.0 will darken the
midtones. You can either enter
the desired gamma value in the
edit box or use the scroll bar to
select your desired value.
Click on the descreen icon, and a
dialog box titled "Descreen" will
appear. There are three items in the top
dialog box: Normal Scan, Default
Setting and Customize. Select
"Normal" then descreen will not
perform onto the scanned images.
Select "Default" to perform the default
setting of various document types. In
addition, select "Customize" to define
your own descreen level by entering a
desired value in the number box.