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A-2 A-61124 March 1999
Document image level
Rank associated with a type of document. Up to four levels —
Level 3, Level 2, Level 1, and Level 0 — can be used. The level
can be set automatically using a Patch Reader accessory,
manually by pressing the Footswitch, by pressing a Level key on
the control panel, or by sending a scanner-unique Level of Next
Document command.
Error diffusion mode
Compromised between binary thresholding and screening; used
for documents containing both continuous tone photographic and
text information. It simulates gray scale while retaining text
readability.
Gray scale image
Refers to a processed image that consists of pixels which are
assigned values based upon a range of gray shades, as opposed
to thresholded images in which each pixel is either black or white.
Gray levels
Discrete shades of gray.
Halftone image
Refers to a printed image that simulates a continuous tone
image. The simulation is achieved by using a series of dot
patterns. Newsprint pictures are an example of halftoned images.
Header
Contains information associated with the raster image file.
Consists of fixed fields (provided by the host computer) and
scanner-determined dynamic fields (image sequence number,
image size in bytes, image level).
Image address
Contains fixed and dynamic information which can be used for
image retrieval.
Initiator
A SCSI device (usually a host) that requests an operation to be
performed by another SCSI device.