Kyocera TASKalfa 4551ci Printing System (11),(12),(13),(14) Color Reference G - Page 62

CIE color model, Hue, saturation, and brightness, color, space, metamerism

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DESKTOP COLOR PRIMER 62 CIE color model In the 1930s, the Commission Internationale de l'Eclairage (CIE) defined a standard color space, a way of defining colors in mathematical terms, to help in the communication of color information. This color space is based on research on the nature of color perception. The following CIE chromaticity diagram is a two-dimensional model of color vision. The arc around the top of the horseshoe encompasses the pure, or spectral, colors from blue-violet to red. Although the CIE chromaticity diagram is not perceptually uniform, some areas of the diagram seem to compress color differences relative to others, it is a good tool for illustrating some interesting aspects of color vision. By mixing any two spectral colors in different proportions, we can create all the colors found on the straight line drawn between them in the diagram. It is possible to create the same gray by mixing blue-green and red light or by mixing yellow-green and blue-violet light. This is possible because of a phenomenon peculiar to color vision called metamerism. The eye does not distinguish individual wavelengths of light. Therefore, different combinations of spectral light can produce the same perceived color. Purple colors, which do not exist in the spectrum of pure light, are found at the bottom of the diagram. Purples are mixtures of red and blue light-the opposite ends of the spectrum. Hue, saturation, and brightness A color can be described in terms of three varying characteristics, called the HSB color model: • Hue: Tint (the qualitative aspect of a color-red, green, or orange) • Saturation: The purity of the color • Brightness: Relative position between white and black

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D
ESKTOP
C
OLOR
P
RIMER
62
CIE color model
In the 1930s, the Commission Internationale de l’Eclairage (CIE) defined a standard
color
space
, a way of defining colors in mathematical terms, to help in the communication of color
information. This color space is based on research on the nature of color perception. The
following CIE chromaticity diagram is a two-dimensional model of color vision. The arc
around the top of the horseshoe encompasses the pure, or spectral, colors from blue-violet to
red. Although the CIE chromaticity diagram is not perceptually uniform, some areas of the
diagram seem to compress color differences relative to others, it is a good tool for illustrating
some interesting aspects of color vision.
By mixing any two spectral colors in different proportions, we can create all the colors found
on the straight line drawn between them in the diagram. It is possible to create the same gray
by mixing blue-green and red light or by mixing yellow-green and blue-violet light. This is
possible because of a phenomenon peculiar to color vision called
metamerism
. The eye does
not distinguish individual wavelengths of light. Therefore, different combinations of spectral
light can produce the same perceived color.
Purple colors, which do not exist in the spectrum of pure light, are found at the bottom of the
diagram. Purples are mixtures of red and blue light—the opposite ends of the spectrum.
Hue, saturation, and brightness
A color can be described in terms of three varying characteristics, called the
HSB
color model:
•
Hue: Tint (the qualitative aspect of a color—red, green, or orange)
•
Saturation: The purity of the color
•
Brightness: Relative position between white and black