Color Rendering Capacity

Color Rendering Capacity

How many colors on earth is a given light source capable of vividly rendering? Under what type of light source can a scene be made the most colorful? Such questions highlight a particular aspect of the color rendering quality of light sources,[1] an aspect relating to the concern of whether differently colored objects under illumination of a certain light source can appear in colors that are significantly different from each other and occupying a wide range of colors. The color rendering capacity is one of several measures of the color rendering quality of light sources, specially devised to be able to answer the above questions.

The idea of the color rendering capacity can be introduced as follows: Associated with each type of spectral power distribution, one and only one color solid can be constructed in a uniform color space.[2] It has been proved that this color solid comprises all the object colors producible under illumination of that spectral power distribution with one unit luminous flux,[3] and the volume of the color solid determines the upper limit for the number of the object colors producible under the given spectral power distribution with one unit luminous flux.[4] This volume of the color solid associated with the spectral power distribution is called the color rendering capacity.[5]

Calculating the color rendering capacity of a light source, i.e. calculating the volume of the color solid associated with the spectral power distribution of the light source, involves a tedious process. A simple program, CRC99, has been available, enabling the color rendering capacity of any light source to be figured out in a few seconds. Note that the color rendering capacity given by CRC99 is actually the volume of the color solid associated with the given spectral power distribution divided by the volume associated with equal energy spectrum. As a result, the color rendering capacity now is an easily remembered and mutually comparable figure proportional to the volume instead of a long string of numerals representing the volume itself. For example, the color rendering capacity now is 0.35 for high-pressure sodium lamps, 0.97 for Deluxe fluorescent lamps, and 1.00 for equal energy spectrum respectively. These results conform with everyday experiences: Fewer high pressure sodium lamps than deluxe fluorescent lamps are found in department stores for commodity lighting, mainly because the commodities under high pressure sodium all appear in monotonous yellow shades while the same commodities under deluxe fluorescent, at the same light level, display a variety of colors, and the resulting colorful scene appeals to customers more strongly. The color solid and the color rendering capacity calculated for the spectrum of the Deluxe fluorescent lamp F7 is shown on the right.

The color solid and the color rendering capacity associated with the spectral power distribution of the Deluxe fluorescent lamps

Notes

  1. ^ MacAdam 1981, p.103.
  2. ^ MacAdam 1981, p. 157.
  3. ^ MacAdam 1981, p. 106.
  4. ^ Xu 2010, p. 29.
  5. ^ Xu 2010, p. 37.

References

  • MacAdam,DL (1981). Color Measurement, Springer-Verlag. ISBN 0-387-10773-8
  • Commission Internationale de l'Eclairage (1986). Colorimetry, CIE.
  • Xu, H (2008). "Correspondence: Colour rendering capacity", Lighting Research and Technology, 257(40).
  • Xu, H (2010). Color Rendering Capacity of Light, Lulu Enterprises. ISBN 978-0-557-29359-9

External links


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • 3dfx Interactive — Industry Semiconductors Fate Bankrupt,[1] most assets bought by Nvidia, fate of remaining assets unknown …   Wikipedia

  • 3D film — For more information on 3D film titles, see List of 3 D films. A 3 D (three dimensional) film or S3D (stereoscopic 3D) film[1] is a motion picture that enhances the illusion of depth perception. Derived from stereoscopic photography, a… …   Wikipedia

  • Metal halide lamp — Metal halide lamps, a member of the high intensity discharge (HID) family of lamps, produce high light output for their size, making them a compact, powerful, and efficient light source. Originally created in the late 1960 s for industrial use,… …   Wikipedia

  • Reef aquarium — See also: Marine aquarium Reef aquarium in Monaco A reef aquarium or reef tank is an marine aquarium that prominently displays live corals and other marine invertebrates as well as fish that play a role in maintaining the coral reef environment.… …   Wikipedia

  • Metal-halide lamp — A metal halide gas discharge lighting system provides illumination for a college baseball game at Olsen Field in College Station, Texas, United States. Note the various colors of the lights as they warm up. Metal halide lamps, a member of the… …   Wikipedia

  • List of energy abbreviations — This is a list of abbreviations found in the context of energy issues. Contents: 0–9 A B C D E F G H I J K L M N O P Q R S T U V W X Y …   Wikipedia

  • literature — /lit euhr euh cheuhr, choor , li treuh /, n. 1. writings in which expression and form, in connection with ideas of permanent and universal interest, are characteristic or essential features, as poetry, novels, history, biography, and essays. 2.… …   Universalium

  • Sega Saturn — Sega Saturn …   Wikipedia

  • History of video games — Part of a series on …   Wikipedia

  • Nintendo DS — This article is about the original Nintendo DS. For its second revision, see Nintendo DS Lite. For its third and fourth revisions, see Nintendo DSi. Nintendo DS …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.