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CIE Chromaticity Diagram 2-degree standard observer Purpose The purpose of this project is to demonstrate how to display a CIE chromaticity chart, as well as the transformations introduced in and In addition, the charts can be displayed using either the 2-degree standard observer, or the degree standard observer, and attempts to explain the difference between standard observers.
The experiments leading to the standard observer were performed using only the fovea, which covers about a 2-degree angle of vision.
The supplementary standard observer was based on color-matching experiments using a degree area on the retina. The observers were instructed to ignore the central 2-degree spot. The supplementary standard observer is recommended when visual perception of more than about 4-degrees is desired.
No real observer is probably exactly like the CIE standard observer. The work included a few foreign post-doctoral fellows but the early work included only Englishmen from the region near to London. The diagrams below, which can be viewed on the "Standard Observer" tab in the Chromaticity program, are the correct size when the program is properly calibrated.
The 1-nm tabulations of the CIE color matching functions are given to seven significant figures.
But according to [Wyszecki82, p. Visual color matching is far from being that precise. See also [Malacara, p. The line connecting the endpoints of the horeshoe is known as the non-spectral "line of purples. Various transformations of the original CIE Chromaticity Diagram have been proposed to correct this distortion and to yield approximately uniform chromaticity spacing.
Ideally, areas of least perceptible differences should be circles but due to non-uniformity of chromaticity diagrams all these areas turn out to be ellipses, which vary in size over the different parts of the diagram.
No output device can generate an accurate image of the CIE diagram since output devices use a fixed number of phosphors or pigments usually three or four and no fixed number of pigments can generate all observable colors.
This formula "crushes" all yellow, brown, orange and red colors into a relatively small area of the diagram between the achromatic point and the spectrum locus.
This area should be as large as possible because of the importance of these colors in food, oil, paint, and other industries. The advantage of the diagram is that the distance between points is now approximately proportional to the perceived color difference, something definitely not true in the diagram.
Historical inertia has won out over technical superiority: Chromaticity Coordinates of Various Phosphors Name.efg's Computer Lab: CIE Chromaticity Diagrams.
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Purpose The purpose of this project is to demonstrate how to display a CIE chromaticity chart, as well as the transformations introduced in and