Compaq S4 100 - Manual (Page 28)

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enter custom settings that range from 35 to 400 lines per inch. To
define the custom descreen settings:
1. Choose the Custom… option from the Descreen drop down
menu. The Custom Descreen window opens.
2. Enter the desired lines per inch setting (between 35 and 400 lpi)
in the Custom descreen lpi #1 text box.
3. Repeat step 2 to define the Custom descreen #2 and Custom
descreen #3 settings.
4. Click OK. The settings you defined appear on the Descreen
setting drop down menu, under the Custom heading.
Changing the Filter Setting
Image filters are used to soften or sharpen edges and boundaries of
an image.
VistaScan provides the following filter options: