请输入您要查询的百科知识：

　

词条 CIE 1960 color space
释义

  1. Background

  2. Relation to CIE XYZ

  3. Relation to CIE 1976 UCS

  4. References

  5. External links

{{About|an obsolete version of the CIE color space|the video color model|YUV}}

The CIE 1960 color space ("CIE 1960 UCS", variously expanded Uniform Color Space, Uniform Color Scale, Uniform Chromaticity Scale, Uniform Chromaticity Space) is another name for the {{nobr|(u, v)}} chromaticity space devised by David MacAdam.[1]

The CIE 1960 UCS does not define a luminance or lightness component, but the Y tristimulus value of the XYZ color space or a lightness index similar to W* of the CIE 1964 color space are sometimes used.[2]

Today, the CIE 1960 UCS is mostly used to calculate correlated color temperature, where the isothermal lines are perpendicular to the Planckian locus. As a uniform chromaticity space, it has been superseded by the CIE 1976 UCS.

Background

Judd determined that a more uniform color space could be found by a simple projective transformation of the CIEXYZ tristimulus values:[3]

(Note: What we have called "G" and "B" here are not the G and B of the CIE 1931 color space and in fact are "colors" that do not exist at all.)

Judd was the first to employ this type of transformation, and many others were to follow. Converting this RGB space to chromaticities one finds[4]{{Clarify|date=August 2013|post-text=The following formulae do not agree with u=R/(R+G+B) and v=G/(R+G+B)}}

or equivalently (for comparative purposes with the equations to follow):

MacAdam simplified Judd's UCS for computational purposes:

The Colorimetry committee of the CIE considered MacAdam's proposal at its 14th Session in Brussels for use in situations where more perceptual uniformity was desired than the (x,y) chromaticity space,[5] and officially adopted it as the standard UCS the next year.[6]

Relation to CIE XYZ

U, V, and W can be found from X, Y, and Z using:

Going the other way:

We then find the chromaticity variables as:

We can also convert from u and v to x and y:

Relation to CIE 1976 UCS

References

1. ^{{cite journal|authorlink=David MacAdam|first=David Lewis|last=MacAdam|title=Projective transformations of I.C.I. color specifications| journal=JOSA|volume=27|issue=8|date=August 1937|pages=294–299| url=http://www.opticsinfobase.org/abstract.cfm?URI=josa-27-8-294|doi=10.1364/JOSA.27.000294}}
2. ^{{cite book|title=Digital Pictures: Representation, Compression, and Standards|publisher=Springer|isbn=0-306-42195-X|author=Arun N. Netravali, Barry G. Haskell|authorlink=Arun Netravali|edition=2E|page=288| url=https://books.google.com/books?id=-TXYfZrCBuQC&pg=PA288&dq=Riemannian+munsell|year=1986}}
3. ^{{cite journal|title=A Maxwell Triangle Yielding Uniform Chromaticity Scales|journal=JOSA|first=Deane B.|last=Judd|volume=25|issue=1|date=January 1935|pages=24–35| url=http://www.opticsinfobase.org/abstract.cfm?URI=josa-25-1-24| quote=An important application of this coordinate system is its use in finding from any series of colors the one most resembling a neighboring color of the same brilliance, for example, the finding of the nearest color temperature for a neighboring non-Planckian stimulus. The method is to draw the shortest line from the point representing the non-Planckian stimulus to the Planckian locus.|doi=10.1364/JOSA.25.000024}}
4. ^{{cite journal|journal=JOSA|title=Quantitative data and methods for colorimetry|volume=34|issue=11|date=November 1944|author=OSA Committee on Colorimetry| pages=633–688|url=http://www.opticsinfobase.org/abstract.cfm?URI=josa-34-11-633}} (recommended reading)
5. ^{{cite journal| url=http://www.opticsinfobase.org/abstract.cfm?URI=josa-50-1-87| title=Brussels Session of the International Commission on Illumination|authorlink=International Commission on Illumination|journal=JOSA|volume=50|issue=1|date=January 1960|pages=89–90|author=CIE|quote=The use of the following chromaticity diagram is provisionally recommended whenever a diagram yielding color spacing perceptually more nearly uniform than the (xy) diagram is desired. The chromaticity diagram is produced by plotting 4X/(X + 15Y + 3Z) as abscissa and 6Y/(X + 15Y + 3Z) as ordinate, in which X, Y, and Z are the tristimulus values corresponding to the 1931 CIE Standard Observer and Coordinate System.}}
6. ^{{Cite conference |location=Brussels |year=1960 |publisher=International Commission on Illumination |title=Official Recommendations |page=36 |series=14th Session |book-title=Publication No. 004: Proceedings of the CIE Session 1959 in Bruxelles |volume=A}}

External links

  • Free Windows utility to generate chromaticity diagrams. Delphi source included.
{{color space}}

1 : Color space
随便看

　

开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。

　

Copyright © 2023 OENC.NET All Rights Reserved
京ICP备2021023879号 更新时间：2024/9/23 10:22:53