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Chapter4 - Color
================
The goal of almost all OpenGL applications
is to draw color pictures in a window on 
the screen.  The window is a rectangular
array of pixels, each of which contains and 
displays its own color.  This chapter explains
the commands for specifying colors and how 
OpenGL interprets them in the following major 
sections:

  o  Color Perception discusses how the eye perceives
     color

  o  Under OpenGL color types we discuss types of 
     display modes, dithering - when to use it 
     and when not to.

  o  In  Specifying color we examine commands used to 
     specify a color
 
  o  Finally we sum up the chapter with a few
     examples on Shading Models.