Spectral and XYZ Color Functions

Functions are scanned for color matching and illuminants.

This is the beginning of a set of functions for working with color as wavelengths (spectral color) and in the xyY and XYZ color spaces.

Current functionality includes:
- spectrumLabel - Add a color bar containing the visible spectrum to a plot's X axis.
- spectrumRGB - Converts wavelengths of light to equivalent RGB values (in the sRGB space).
- colorMatchFcn - Raw data of popular color matching functions (spectra to XYZ) for various standard observers:
  * CIE 1931 2-degree
  * CIE 1964 10-degree
  * CIE 1931 2-degree modified by Judd (1951)
  * CIE 1931 2-degree modified by Judd (1951) and Vos (1978)
  * Stiles and Burch 2-degree (1955)
  * Stiles and Burch 10-degree (1959)
- illuminant - Raw data for the A, D65, and E standard illuminants.

Requirements:

· MATLAB 7.0.1 or higher
· MATLAB's Image Processing Toolbox