Glossary
3
R
Proof Sign-off:
tanto name
SEI Y.Takasaki M.Fujimori
leader name M.Fujimori
editor name
SEI M.Kauppi
R4C449
Rev. C
A5 size
GLOSS.FM
12/2/99
Pass 3
monochrome
Black and white images, or images represented only by the intensity of
luminosity.
OCR
Optical Character Recognition. The technology that allows computers to “read”
text from physical objects. OCR requires a graphical representation of text to
interpret, which usually comes from a scanned image.
page sequence
The type of color scanning in which the entire image is scanned once for each
separate color.
pixel
Short for picture element. Each image is composed of a number of pixels. Pixels
are also counted in units of dots.
plain bi-level
Bi-level image data without the halftoning process.
port
An interface channel through which data is transmitted between devices.
primary colors
Basic colors. See additive primary colors and subtractive primary colors.
resolution
Indication of how finely an image is resolved into pixels. Measured in dots per
inch (dpi), pixels per inch (ppi), or samples per inch (spi).
scan
An operation performed by the sensor and the carriage. The image is divided
into pixels by scanning.
scanning area
The physical size of the image that can be scanned by the scanner.
subtractive primary colors
The colors of cyan, magenta, and yellow (CMY) - which produce black when
mixed in certain amounts. In printing, black is often added to give more definition
as mixing of actual inks cannot produce pure black.
threshold
A reference point that is used to determine whether data will be processed as
“on” or “off”. In the case of color image data, “on” means that a certain color will
appear in a pixel or dot, and “off” means that color will not appear there.
tone correction
A method of adjusting the tone curve so that the reproduction results on different
types of output devices have gradations similar to the original image.
