A-61580 November 2007
4-3
Toggle Patch
— the toggle patch is a type 4 patch that is used to
trigger the scanner to change from the current image stream (black and
white) to the alternative image stream (color/grayscale). This provides
color-on-the-fly functionality for customers who want to scan the
majority of their documents black and white with the option to switch to
color and back when desired. When a toggle patch is detected, this
determines the side(s) whose image output is toggled between black
and white and color/grayscale. Select either
Off, Same Side, Both
Sides
or
Detect Only
.
•
Off
: no patches will be used.
•
Same Side
: only the side which recognizes the patch sheet will
toggle. For example, if a patch sheet contains a patch on the front
side only, the front stream will toggle but the rear stream will not.
•
Both Sides:
if a patch is recognized on either the front or the rear,
both front and rear streams will toggle.
•
Detect Only:
this option should be used when the capture
application software (not the scanner) is responsible for determining
when to toggle. When using this option, information in the image
header will indicate that the scanner has recognized a type 4 patch.
The scanner will not take any other action.
Dots per inch
(dpi) or resolution
indicates the scanning resolution,
which largely determines the quality of the scanned image. The greater
the resolution, the better the reproduction. However, scanning at a
higher resolution also increases scanning time and file size.
Choose a resolution value from the drop-down list. The default is 200
dpi. Available resolutions are:
•
Color/Grayscale:
100, 150, 200, 240 and 300
•
Black and white:
200, 240, 300 and 400
Cropping
allows you to capture a portion of the document being
scanned. All cropping options can be used with color/grayscale and
black and white images. Front and Back cropping are independent,
however, for dual stream scanning, color/grayscale and black and white
cropping must be the same per side. Only one cropping option can be
assigned per image. Select one of the following options:
•
Automatic:
dynamically adjusts the cropping window for different
document sizes based on the edges of the image.
•
Aggressive:
eliminates any residual black border on any image
edges. In order to achieve this, there is a possibility that a small
amount of image data from the edge of the document may be lost.
•
Fixed to Transport:
(used for batches of same-sized documents)
allows you to define the area to be imaged. Fixed to Transport
cropping is used in conjunction with paper size and page layout and
assumes you are center-feeding your documents. If you are not using
center feeding, you must select the Layout tab to define your scan
area. See the section entitled “Layout tab” later in this chapter.
