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A-61510 January 2005 2-33
Transfer Patch Code
The image header reflects when a Transfer patch code is
detected on a document. A Transfer patch is considered to be a
Level 0 document. The IA level for the next document following
the Transfer patch is assigned to the level (Level 2 or Level 3)
that has been previously set. The scanner cannot print on
documents containing Transfer patches. In the image header for
the document containing the Transfer patch, the document level
is returned as 0 and the patch type returned as T to reflect the
Transfer patch definition. For the document following the
Transfer patch document the image header will contain a
document level of 2 or 3 depending on the Transfer patch type
definition and will reflect no patch detected.
Toggle Patch
The Toggle patch is a Type 4 patch that is used to trigger the
scanner to switch from the current image stream (bi-tonal) to the
alternative image stream (color). This logic is performed inside
the scanner. Images of the toggle patch sheet will not be returned
to the host unless you also enable patch reading and select the
Type 4 patch. Common uses for this patch would be a document
set, which is primarily bi-tonal but has some color content.
Placing a Toggle Patch sheet before and after the color
document(s) would allow changing from bi-tonal to color and
back on-the-fly during scanning with no additional operator
action.
NOTE: Toggle patch may also be used to trigger the scanner to
switch from bi-tonal to grayscale and vice versa.
Additional Patch Codes
Additional patch codes enable the host to implement any type of
workflow-dependent processing to be based on the insertion of
these additional patches into the document stack. Additional
patches are patch types 1, 4 and 6.