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Chromaticity Diagram

SmartNote: 21
Type: Term
ColorGeek factor: unrated
The Chromaticity Diagram is a horseshoe-shaped graph of the CIELab color space where the L component has been removed and the a and b components are then graphed in 2 dimensions. It is a very useful diagram for getting a quick feeling for not only the range of colors humans can perceive but the ranges of colors (gamuts) that different devices can (or cannot) display.

See Also

Term: CIELab, Lab

Colortron

SmartNote: 211
Type: Term
ColorGeek factor: unrated
A spectrophotometer from Light Source Technologies capable of measuring reflection and transmission samples as well as color monitors. (Lightsource is owned by X-Rite)

CRD Color Rendering Dictionary

SmartNote: 212
Type: Term
ColorGeek factor: unrated
A table that can be downloaded to a PostScript Level II RIP to control color transformations handled by PostScript. CRD?s gan often be generated by the same software that produces ICC Profiles.

See Also

Term: Postscript
Term: Profile

Delta E (dE)

SmartNote: 213
Type: Term
ColorGeek factor: unrated
A measurement of "color error", or "color difference" based on L*a*b* coordinates. A dE of 1.0 is a just- perceptible difference. A dE of 4 to 7 is the typical limit of acceptable error in commercial reproduction, but the limit varies in different color regions and applications.

Density

SmartNote: 214
Type: Term
ColorGeek factor: unrated
A measure of darkness or amount of color used widely in photography and printing. The logarithm to base 10 of the reciprocal of fractional transmittance or reflection.

See Also

Term: Reflectance
Term: Opacity

Device-Dependent Color

SmartNote: 215
Type: Term
ColorGeek factor: unrated
Measuring and "profiling" input and output devices in terms specific to each device. A scanner's RGB values have no simple relationship to a printer's CMYK values for the same color because both values are device-dependent.

Device-Independent Color

SmartNote: 216
Type: Term
ColorGeek factor: unrated
(1) The concept of automatically good color reproduction of an image from any source on any destination device. (2) Measuring and "profiling" input and output devices in terms that are independent of their native color spaces. (3) An intermediate color space to which scanners and printers are calibrated and through which images are translated from one device to another.

Digital Swatchbook

SmartNote: 217
Type: Term
ColorGeek factor: unrated
A spectrophotometer from X-Rite Corporation. It is a hand-held device which is good for taking readings of anything you may have at hand. If you are reading many patches, as when creating a printer profile, you may want a more automated solution like the DTP41 strip-reading spectrophotometer or the GretagMacbeth Spectrolino / Spectroscan combination which combines a spectrophotometer with an automated x-y reading table.