This document discusses various color order systems and color spaces including NCS, XYZ, Munsell, CIE Lab, CIE xyY, and CIE RGB. It explains that the CIE xyY color space uses chromaticity coordinates x, y, and Y to represent colors, with Y for value and x,y locating the color in a chromaticity diagram. It also introduces the CIE LCH color space which uses polar coordinates of L* for lightness, C* for chroma, and h° for hue angle to describe a color, relating better to earlier physical color systems like Munsell.

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Granch Berhe

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Color order
systems
And Color spaces
NCS
XYZ
Munsell
CIE Lab
CIE xyY
CIE RGB

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Color systems

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CIE RGB Color space

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Chromaticity values and diagrams

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Dominant wave length and Purity Color representation

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CIE (Y,x,y) Color Solid
• Tristimulus values, unfortunately, have limited use as color
specifications because they correlate poorly with visual
attributes. While Y relates to value (lightness), X and Z do
not correlate to hue and chroma. As a result, when the 1931
CIE standard observer was established, the commission
recommended using the chromaticity coordinates xyz. These
coordinates are used to form the chromaticity diagrams. The
notation Yxy specifies colors by identifying value (Y) and the
color as viewed in the chromaticity diagram (x,y).
• Hue is represented at all points around the perimeter of the
chromaticity diagram. Chroma, or saturation, is represented
by a movement from the central white (neutral) area out
toward the diagram’s perimeter, where 100% saturation
equals pure hue.

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LCH
• While CIELAB uses Cartesian coordinates to
calculate a color in a color space, CIELCH uses
polar coordinates. This color expression can be
derived from CIELAB. The L* defines lightness, C*
specifies Chroma and h° denotes hue angle, an
angular measurement. The L*C*h° expression
offers an advantage over CIELAB in that it’s very
easy to relate to the earlier systems based on
physical samples, like the Munsell Color Scale.

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