COLOR SCIENCE

[ Spectra | Chromaticity | Blackbody | Color Links ]

SPECTRA

The spectra below were generated using different RGB values for wavelengths between 380nm and 780nm. This was done by using a FORTRAN program that uses linear approximations for the RGB color coefficients. Alphabet Systems used this FORTRAN program to make their JavaScript Visible Spectrum.


Continuous Spectrum


Absorption Spectrum of Hydrogen


Emission Spectrum of Hydrogen

CHROMATICITY DIAGRAM

The CIE XYZ chromaticity diagram below was created using a FORTRAN program that computes the red, green and blue color coefficients for each coordinate (x,y). For another approach, see the UNIX cietoppm utility which is a NETPBM extension.

BLACKBODY RADIATION

The diagram below was created using a FORTRAN program that computes the red, green and blue color coefficients for hot objects. The program uses the CIE color matching functions and Planck's distribution function for the spectral radiance of a blackbody. Someone has now converted the FORTRAN code into C code.

EYE SENSITIVITY

The three white curves below indicate the sensitivity level for the three types of cones. The black curve indicates the sensitivity of the rods[1]. The peak response moves from 550 nm to 500 nm at night.[2].

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Dan Bruton
[email protected]

Roy G. Biv