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64 A-61527 May 2006
Color Dropout options Electronic color dropout is used to eliminate a form’s background so
that a document management system may automatically — through
OCR (Optical Character Recognition) and ICR (Intelligent Character
Recognition) technology — read pertinent data without interference
from the lines and boxes of the form. You can select the desired
dropout color, and alter the filter threshold and background.
Electronic color dropout is available only for binary and grayscale
images.
Dropout Color the i55/i65 Scanners can drop out red, green or blue.
None is the default.
Background Value this value will be substituted in the grayscale
(pre-thresholded) image for the color being removed. Therefore, this
value should be higher than the threshold value selected on the
Scanner Settings dialog box for this pixel to become the background
color. The default value is 245. For example, if you are scanning a white
document with a green form and you have selected a binary threshold
value of 127, you should choose an electronic color dropout
background value greater than 127 so the substituted pixel will be white
in the dropped-out image.
Threshold value the value that is used to identify the color which
will be dropped out. This value is applied to the color area. Color with a
Red/Green/Blue component more than the entered value is dropped.
This setting determines how much of the selected color is dropped out.
A lower value will leave more of the selected color in, while a higher
value will drop more of the selected color out. The default value is 175.