UMAX Technologies Astra 3400 - Manual (Page 24)

Custom – Opens the Custom Descreen window, which allows you to specify a custom line screen
value. Refer to the Using Custom Descreen Settings section for information about how to set custom
descreen values.
Using Custom Descreen Settings
You can also specify custom descreen settings that you can use when you want to change the lines per inch
setting to eliminate patterns that are generated while scanning printed images. You can 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:
No Filter – Use this option when you do not want to sharpen or blur the image.
Sharpen – Use this option to sharpen lines that may be fuzzy or not clean in the original image.
Sharpen More – Use this option when you want to sharpen the image more than the standard Sharpen
filter does.
Blur – Use this option when you want to soften the edges of an image.
Blur More – use this option when you want to soften the edges more than the Blur filter does.
Changing the Scan Factor
Scaling lets you automatically enlarge or reduce an image from its original size (100%) as it is scanned.
The scale factor affects the size of the scanned image and the printed scan output.
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