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i800 Series Scanners
Color Dropout tab
9A-36
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. The i800 Series Scanners can drop out either red, green, or blue.
The Color Dropout tab allows you to select the desired dropout color, and alter
the filter threshold and background.
Color Dropout is only available for bitonal image setup.
Color dropout—select the color to be removed. Select None if you do not
want any color to be removed.
For example, if your image contains red text or a red background, choose
Remove red to remove the red text or red background.
Filter threshold—enter a value between 0 and 255. The default is 175. Filter
threshold is the value that is used to identify the color which will be dropped
out. This value is applied to the color space.
Background—enter a value between 0 and 255. The default is 245. 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 Filters tab for this pixel to become the background color.
For example, if you are scanning a white document with a green form and you
have selected a bitonal threshold value of 127. You should pick an electronic
color drop-out background value greater than 127 so the substituted pixel will
be white in the dropped-out image.
A-63054 February 2004
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