http://people.csail.mit.edu/jaffer/Color/Color-Scheme
	Color-Scheme

A color is represented by coordinates in a 3-dimensional space. This simple idea belies the difficulties faced by the color novice:

• Over the century the CIE (Commission Internationale de l'Eclairage) has issued color standards, some have been abandoned and some superseded. Yet most are still in common use, often without full identification.
• The CIE terminology distinguishes letter case (xyY) and uses '*' to indicate logarithmic scales, which seems to be honored mainly in the breach.
• The transformations converting coordinates of one color-space into coordinates of another are generally non-linear.
• Some color spaces are devised to reduce computational costs. Increased processor performance reduces the need for these compromises.
• Some widely referenced web pages give incorrect color algorithms.
• X11's color management system is rendered useless by its fiction that CRT monitors' (and X11 default) color-spaces are linear RGBi.
• Most of the web-published color-name dictionaries are corrupted copies of the 1994 vintage X11 rgb.txt, which had poor quality to begin with.
• Major sources of image and color data use proprietary or trade-secret color encodings.

A plethora of color interfaces of varying quality have been developed for application programs. This solid implementation in SLIB will improve utility for users while freeing developers from reinventing this wheel.

SLIB's color package provides methods to specify, compute, and transform colors in the color spaces CIEXYZ, CIEL*a*b*, CIEL*u*v*, CIEL*C*h, RGB709, sRGB, e-sRGB, xyY, spectra, and chromaticity. It also provides for reading and writing of a textual representation of colors; and color-name lookup from multiple dynamically-loadable databases.

• Color Data-Type
• Color Spaces
• Spectra
• Color Difference Metrics
• Color Conversions
• Color Names
• Daylight