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50 | SPECTRAVIEW II - USER'S GUIDE
Gamma – The relationship between the input video signal to a display monitor and the screen
output luminance. Typically the screen luminance follows a mathematical power function of the
input video signal, the exponent of which is called the gamma.
Gamut – The range of colors that can be reproduced on a particular device such as a monitor
or printer, or that can be distinguished by a sensing device such as a scanner or the human
eye.
Hue – The basic attribute of color such as red, green, yellow, blue or purple.
ICC – International Color Consortium, a color industry group working on standards for color
management technology.
ICC Profile – A file conforming to the standards set by the ICC that contains a description of
the color characteristics of a device such as a monitor, printer, or scanner. In Windows ICC
profiles have the file extension ".icm".
Image Color Management (ICM) – The Color Management System built into the Microsoft
Windows operating systems.
Intensity – Intensity specifies the luminance or brightness of white when displayed on the
screen.
Kelvin – An absolute temperature scale denoted by K. Zero Kelvin (0K) is equivalent to –273°
Celsius.
Lab – (See CIE Lab)
LED – Light Emitting Diode.
LCD – Liquid Crystal Display.
Lightbox – An enclosure with controlled lighting conditions used to evaluate proofs, transpar-
encies and other printed materials. Typically a lightbox is illuminated to approximate a standard
illuminant such as D50 or D65.
Luminance – A measure of the brightness or intensity of light, usually expressed in units of
Candelas per meter squared (cd/m
) or foot Lamberts.
²
Look Up Table (LUT)
A table used to translate input values to output values. SpectraView
–
displays use 10 or 12 bit internal LUTs to apply Gamma corrections and Tone Response
Curves.
MCS (Monitor Calibration Settings) file – A file used by SpectraView II to store the results of
the calibration, including the monitor settings and measurements.
Metamerism – A phenomenon in which two color samples appear to match in color under cer-
tain lighting conditions but not in others.
MPCD (Minimum Perceptible Color Difference)
A unit of measure, developed by the CIE,
–
to define the change in light and color required to be just noticeable to the human eye.
Nit – A unit of luminance equal to Candelas per meter squared (cd/m
).
²
NTSC – National Television Standards Committee. A standard for encoding video signals used
widely in North America and Japan.
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