© Bob DiNatale
Bob's Glossary
Color Model: A color measurement scale or system that numerically specifies the perceived attributes of color. Used in computer graphics applications and by color measurement instruments.
Color Space: A three-dimensional geometric representation of the colors that can be seen and/or generated using a certain color model.
ColorSync: Built-in color management architecture for Apple Macintosh computers. Third-party vendors utilize the ColorSync framework to provide device calibration, device characterization, and device profile-building methods.
Device Profile: Device-specific color information that is a characterization of a device’s color rendering and reproduction capabilities. Monitor profiles, scanner profiles, and printer profiles are utilized in a color management system such as Apple ColorSync to help the devices communicate color information with each other. Profiles are created by calibration and/or characterization method.
Gamut: The range of different colors that can be interpreted by a color model or generated by a specific device.
Metamerism, Metameric Pair: The phenomenon where two colors appear to match under one light source, yet do not match under a different light source. Two such colors are called a metameric pair.
Viewing Booth: A enclosed area with controlled lighting that is used in graphic arts studios, service bureaus, and printing companies as a stable environment for evaluating proofs and press sheets.
See D50 & D65.

D 50 : The CIE Standard Illuminant that represents a color temperature of 5000°K. This is the color temperature that is most widely used in graphic arts industry viewing booths. See Illuminants D.
D 65 : The CIE Standard Illuminant that represents a color temperature of 6504°K.
Device-Independent: Describes a color space that can be defined using the full gamut of human vision ("standard observer") independent of the color-rendering capabilities of any specific device.
Electromagnetic Spectrum: The massive band of electromagnetic waves that pass through the air in different sizes, as measured by wavelength. Different wavelengths have different properties, but most are invisible–and some completely undetectable–to human beings. Only wavelengths that are between 380 and 720 nanometers in size are visible, producing light. Invisible waves outside the visible spectrum include gamma rays, x-rays, microwaves and radio waves.
Gamut Compression: Or tonal range compression. The color space coordinates of a color space with a larger gamut are reduced to accommodate the smaller gamut of a destination color space. For example, the gamut of photographic film is compressed for representation in the smaller CMYK gamut used for four-color process printing. See Gamut.
Gamut Mapping: Converting the coordinates of two or more color spaces into a common color space. Often results in tonal range compression. See Gamut Compression.
IT8: Series of test targets and tools for color characterization established by ANSI (American National Standards Institute) Committee IT8 for Digital Data Exchange Standards. Different IT8 targets are used to characterize different devices such as scanners and printers.
Soft-Proofing: The process of viewing color of the final print BEFORE printing! This is done by sending the file's color data to a calibrated monitor THROUGH an ICC printer profile. This allows us to make adjustments for the physical (absorption \ reflecting) characteristics of the paper \ ink combination.
Tristimulus Data: The three tristimulus values that combine to define or generate a specific color, such as R 255/G 255/B 0. Tristimulus data does not completely describe a color–the illuminant must also be defined. Also, in device-dependent color models such as RGB, the capabilities of the viewer or color-rendering device must also be defined. See Device-Dependent.
version 1.1 - Last Updated: 08/30/2001