Glossary

CGATS

CGATS.5 Data Exchange Format, from the Annex J, of the ANSI CGATS.5-1993 standard.
This is a general purpose ASCII file format suitable for representing color data, and widely used to store color test values. Argyll uses this as a base, human readable format, for a variety of purposes.

.ccmx

Colorimeter Correction Matrix. This is an ASCII text, CGATS, ArgyllCMS specific format, used to hold a 3x3 correction matrix. The matrix is for a specific display and Colorimeter, and is used to transform the instruments XYZ values to make them better match a reference spectrometers measurements for that display. The file contains a description of the display, Colorimeter and reference Spectrometer. See ccxxmake for more information.

.ccss

Colorimeter Calibration Spectral Set. This is an ASCII text, CGATS, ArgyllCMS specific format, used to hold a set of display spectral samples. For Colorimeters that have known sensor spectral sensitivity information (such as the i1d3 and Spyder4), this allows a calibration to be created that is tuned for a particular display. The file contains a description of the display, the display technology type, the type of spectrometer used for taking the readings. See oeminst and ccxxmake for more information. The format is similar to a .sp file.

Chromatic Adaptation

Chromatic Adaptation is the human visual systems behavior of adapting so that the dominant, non-chromatic colors in our field of view appear neutral, thereby maximizing our sensitivity to small color differences. With typical materials, this is dominated by the color of the illumination of the scene. When dealing with measured colors, it is important to be able to mimic this behavior, and this is typically done using a Chromatic Adaption matrix, with the white point of the media or colorspace used as an approximation of the viewers state of adaptation.

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