Kodak i780 Manual page 17

Zone processing
A-61504 October 2007
Patch Detect  indicates whether or not the scanner detected a toggle
patch on the document (side independent). If a toggle patch appears on
a document, all images created from this document will have this
indicator set in the image header.
Toggle Patch  indicates the side of the document where the toggle
patch was detected. If a toggle patch appears on a document, only the
images created from the side of the document containing the patch will
have this indicator set in the image header.
Some applications have a requirement to store part of an image in color
or grayscale and the rest of the image in black and white format (this
saves storage space by not storing the entire image in color or
grayscale). Zone processing is a fixed crop window (the zone) located
relative to the upper left corner of a document. It allows the operator to
select via the host application an area on the document to be delivered
in color, grayscale or black and white format (a separate window for
both black and white and color/grayscale may be defined). Different
zones may be selected for both the front and rear of the image.
This feature may be used in conjunction with auto cropping. Following
is an example of producing a color zone.
Original
Black and white image Relative Cropping
2-13