Contex SD One+ - Page 55

Service Guide SD One+ 55
ATAC:
Automatic Thickness Adjustment Control - A special technology that allows the scanner pressure platen to be raised
to accommodate thick originals and then lowered - both actions performed by pressing a key from the operators
panel. Sensors in the platen detect when perfect pressure is applied to the the original and automatically stop the
downwards motion of the platen so it rests on the original with an optimal grip.
Bitmap:
An image format made from a matrix of individual pixels (.bmp).
Bitmapped Image:
A bitmapped image is a computer file representing a line-art image that was scanned with a scanner. Refers to the
pattern (map) of bits that are either black or white.
Black Level:
The Black Level is a setting in scan programs used to change dark greytone colors to true black. For example, if one
is copying a brochure with a mixture of text and pictures, the text will often be digitized to a color that we may see as
black but really is a dark greytone. When the printer digests this greytone data, it will print the original’s text with a
halftone pattern, meaning scattered dots instead of solid black. By increasing the Black Level value, one can get the
text to be copied in real black and it will therefore appear clearer.
Black Point Adjustment:
An adjustment made that will determine the amount of shadow detail in an image. It is considered
proper to set the black point so that the darkest part of an image will only just have zero detail.
Blueprint:
A process of photographic printing used mainly for copying architectural and mechanical drawings; produces blue
lines on a white/bluish background.
Blur:
The averaging of pixel elements.
Brightness Adjustment:
An adjustment on a scanner that allows the user to compensate for a light or dark original.
Calibration:
Adjusting a device so that it performs in accordance with an established standard. Scanner calibration is minimizing
color deviation between scanned ANSI IT8 reference color patches and the known color reference values. Generally,
Calibration is the process of setting a device to known color conditions - stabilizing the device to a known and
quantifiable state. Calibration is commonly done with devices that change color frequently, such as monitors
(phosphors lose brightness over time), scanners (light changes) and printers (proofers and other digital printing
devices can change output when colorant or paper stock is changed).
CALS:
Computer-aided Acquisition and Logistics Support (CALS) standard, a U.S. Defence Department and industry
initiative that addresses the design, manufacture, and support issues of generation, access, management, and use of
technical data in digital form.