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GL-4
IRAS
Initialization of the hardware.
Landscape
A document is transported and read with the long side vertical to the moving direction.
Letter size
A standard paper size used in the U.S.A. and other countries. Paper size is 8-1/2 x 11 inches (215.9 x
279.4 mm).
Linedrawing mode
Selecting linedrawing mode makes threshold and contrast settings effective but prevents brightness from
being set. The specified threshold value determines whether black or white pixels are scanned. Line-
drawing mode is therefore appropriate for scanning text and line art images.
Manual Feed mode = Manual Mode
Requires the operator to feed each document manually to the hopper table.
Mirror image
The read image is symmetrically flipped to produce a mirror image of the original detected in the main
scanning direction.
Noise removal
Isolated noise from an image appearing as black spots in white areas and voids in black areas is removed
to improve image quality.
Operator panel
A panel containing the scanner indicators and buttons. The operator panel is used to control scanner
operations such as loading document, selecting features, and changing setup options.
Outline extraction
The boundary between black and white areas is traced and the outline extracted for closed areas.