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HD Ultra X Service Guide
The Black Level is a setting in scan programs used to change dark graytone 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 graytone. When the printer digests this graytone 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.
CCD
Charge Coupled Device, CCD is the image sensor in the scanner that converts light to voltages. These
voltages are converted by the scanner into the image.
CCITT Group3
Standard run length compression format used with FAX transmission. It utilizes modified Huffman coding
to further compress the run length numbers. Most scanner file formats are dialects of this format.
CCITT Group4
Two-dimensional compression format, giving very compact image files. Standardized by CALS (MIL
28002) and ISO-ODA for Drawing Archival and Interchange.
CIE LAB
A device-independent color space specified by CIE, used in modern color management software to
facilitate conversion of data from a scanner to a display, or from a display to an output device.
CIE
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