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=Black Body=
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In terms of frequency (<math>\nu</math>) or wavelength (''λ''), Planck's law is written:<ref name="Planck 1914 6 168">{{harvnb|Planck|1914|pp=6,&nbsp;168}}</ref><ref name="Chan8">{{harvnb|Chandrasekhar|1960|p=8}}</ref><ref name="Rybicki 1979 22">{{harvnb|Rybicki|Lightman|1979|p=22}}</ref>
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:<math>B_\nu(T) = \frac{ 2 h \nu^{3}}{c^2} \frac{1}{e^\frac{h\nu}{k_\mathrm{B}T} - 1},</math> <math>\text{  or }\,</math> <math>B_\lambda(T) =\frac{2 hc^2}{\lambda^5}\frac{1}{ e^{\frac{hc}{\lambda k_\mathrm{B}T}} - 1}</math>
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(source http://en.wikipedia.org/wiki/Planck%27s_law)
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=RUFF STUFF=
 
=RUFF STUFF=
  
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1963 Illuminants (more accurate daylight conditions):
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1963 D Illuminants (more accurate daylight conditions):
* Illuminant D followed by the first 2 digits of the CCT (e.g. D65 = D 6500K)
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* Illuminant D = Phases of daylight. Necessarily followed by the first 2 digits of the CCT (e.g. D65 = D 6504K)
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* Represent daylight more completely and accurately than do Illuminants B and C because the spectral distributions for the D Illuminants have been defined across the ultraviolet (UV), visible, and near-infrared (IR) wavelengths (300–830 nm).
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* Most industries use D65 when daylight viewing conditions are required
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* D50 is used by graphic arts industry => more spectrally balanced across spectrum
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Other illuminants:
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* Illuminant E = Equal energy illuminant
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* Illuminant F = Fluorescent lamps of different composition.
  
  
  
==References==
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=References=
 
An Introduction to Appearance Analysis (2001) http://www.color.org/ss84.pdf
 
An Introduction to Appearance Analysis (2001) http://www.color.org/ss84.pdf

Revision as of 16:28, 29 December 2011

Black Body

In terms of frequency (<math>\nu</math>) or wavelength (λ), Planck's law is written:[1][2][3]

<math>B_\nu(T) = \frac{ 2 h \nu^{3}}{c^2} \frac{1}{e^\frac{h\nu}{k_\mathrm{B}T} - 1},</math> <math>\text{ or }\,</math> <math>B_\lambda(T) =\frac{2 hc^2}{\lambda^5}\frac{1}{ e^{\frac{hc}{\lambda k_\mathrm{B}T}} - 1}</math>

(source http://en.wikipedia.org/wiki/Planck%27s_law)


RUFF STUFF

CCT = Correlated Color Temperature (6500K, etc.)


CIE Illuminants =>

  • General lighting conditions (when taking a picture, or displaying one).
  • Spectral characteristics similar to natural light sources
  • Reproducible in the laboratory


1931 Illuminants:

  • Illuminant A = Typical Incandescent Light
  • Illuminant B = Direct Sunlight
  • Illuminant C = Average daylight from total sky (ambient sky light)


1963 D Illuminants (more accurate daylight conditions):

  • Illuminant D = Phases of daylight. Necessarily followed by the first 2 digits of the CCT (e.g. D65 = D 6504K)
  • Represent daylight more completely and accurately than do Illuminants B and C because the spectral distributions for the D Illuminants have been defined across the ultraviolet (UV), visible, and near-infrared (IR) wavelengths (300–830 nm).
  • Most industries use D65 when daylight viewing conditions are required
  • D50 is used by graphic arts industry => more spectrally balanced across spectrum


Other illuminants:

  • Illuminant E = Equal energy illuminant
  • Illuminant F = Fluorescent lamps of different composition.


References

An Introduction to Appearance Analysis (2001) http://www.color.org/ss84.pdf