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A-61517 October 2004 4-21
Color Dropout
Electronic color dropout is used to eliminate a form’s background so that
a document management system may automatically (through OCR and
ICR 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. The i100 Series Scanners can
drop out red, green or blue. None is the default.
Electronic color dropout is available only for binary images.
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 pick an electronic color dropout background value greater
than 127 so the substituted pixel will be white in the dropped-out image.
For iThresholding, the scanner will automatically determine the value for
this. If the value the scanner determined is lower than the one you
entered, that value will be used. Therefore, if using iThresholding, it is
suggested that you leave the value at the default.
Threshold Value the value that is used to identify the color which will
be dropped out. This value is applied to the color area. The default value
is 175.