What sane person could live in this world and not
be crazy?  - Ursula K. LeGuin

Concept 2.2 : Color-Index Display Mode
=======================================

Idea:
=====
With color-index mode, OpenGL uses a color map 
(or lookup table), which is similar to using a palette 
to mix paints.  
In color-index mode, the number of simultaneously
available colors is limited by the size of the
color map and the number of bit planes available.

Choosing between RGBA and Color-Index Mode
==========================================
This depends on the hardware type and the needs of
the application.

For most systems, more colors can be simultaneously
represented with RGBA mode than with color-index mode.
Also for several effects, such as shading, lighting
texture mapping and fog, RGBA provides more 
flexibility than color-index mode.

You might prefer to use color-index mode in the 
following cases:
 o  If you are porting an existing application that
    makes significant use of color-index mode, it 
    might be easier to not to change to RGBA mode.

 o  If you have a small number of bit planes available
    RGBA mode may produce noticeable coarse shades of
    color.

 o  Color index mode can be useful for various tricks, 
    such as color-map animation and drawing in layers.