Kofax UP-D005-0001 Uživatelská příručka stáhnout pdf (Strana 66)

Chapter 2

56 VirtualReScan (VRS) User’s Guide

Removing Noise from a Document

Follow these general rules for removing noise from a document:

 If you have batches of mixed documents with varying quality, never use the

Speckle Removal filter. You could risk losing information on documents.

 If the noise was produced by bleed-through of text from the back side or

background patterns (such as the patterns commonly found on boarding

passes), decrease the contrast from the Clarity panel. If text starts to disappear

as you remove the noise, compensate by adjusting the Brightness slider to a

lower setting.

 If the noise is produced by shaded backgrounds, gradients, or dark-colored

paper, increase the brightness from the Clarity panel.

 If you have only one or two kinds of documents with consistent quality, try to

apply various levels of the speckle removal filters.

 If the filter removes part of the characters even at low levels of the speckle

removal filter, apply the rules for mixed batches.

Filling Holes

When scanning pages with marks from notebook holes or tractor feed holes, you may

prefer not to retain the hole marks in the scanned image. If you select the Fill Holes

check box, VRS will automatically fill in the hole marks on the images with the

background color of the surrounding area.

Note This feature is supported with scanners that produce images with a black

background.

X To update the Noise panel settings

1 From the VRS Adjustment Controls, select the Noise panel.

2 Use the Line Filter slider to select the amount of thinning/thickening to apply

to image elements.

 Move toward Thin for image elements ballooned or blended together.

 Move toward the Thick setting for image elements too thin or too light.

3 Use the Speckle Removal Filter slider to remove unwanted black dots.

 Move the slider toward Small if removal of small dots will achieve the

desired image quality.

 Move the slider toward Medium if removal of small and medium dots will

achieve the desired image quality.

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Kofax UP-D005-0001 Uživatelská příručka Strana 66