FUJITSU 32 - Manual (Page 73)

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If this option is selected, color data is reversed. If this option is not selected, the color values
of the reproduced image correspond to the original image.
Some applications do not permit normal operation. If this occurs, contact the manufacturer
of the application.
Some scanner models do not support this function. Refer to "Relevant Image Scanner
Specification" in Appendix.
♦ Dropout Color (Grayscale only)
You can scan images by removing one of the primary colors (green, red, or blue), which you
select. This is useful, for example, when you scan black letters with red outlines and you
want only the black part of the letters to be scanned.
When "White" is selected, no color dropout occurs but it may be some loss of light yellow
color.
When "None" is selected, no color dropout occurs but scanning may slow down depending
on the compatibility of your PC’s operating environment.
Some scanner models do not support this function. See "Relevant Image Scanner
Specification" in Appendix.