iVina BulletScan S300, User Manual

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S300 Manual V.5 Aug 2010 4-25
4.4 The Color Dropout Tab
4.4.1 Color Dropout Selection
Color Dropout is a special type of image processing designed to
improve OCR results by removing specific types of background
color content. Typically this is used in conjunction with
specially designed forms that have colored boxes or
checkboxes that people fill in. Using dropout allows you to
remove these specially colored boxes from the image and
provides you with better OCR results. It can also be used to
remove a specific background color if it is causing a lot of noisy
speckling.
From the dropdown menu, you can select any of the standard
RGB color channels to be removed, or Custom to allow you to
specify your desired color to be removed by entering its RGB
(Red, Green, and Blue) value respectively.
Tolerance: Specify the allowable color range to be removed for
the color you selected. Specified range: 1 ~ 100
The large the numeric value, the wider the color dropout range
is.
Note that this function is only for outputting black & white or
gray images.