RGB - HLS
---------

MapEdit uses two color systems to define
new color maps.
RGB (Red, Green, Blue)
The system used by the screen and the
device hardware is directly used by the
field sliders.
They are graduated 0 to 255, their
combinations offer more than 16 millons
different colours.
HLS (Hue, Luminance, Saturation)
A vertical double cone colour space,
defined by :
H: angle in the cone : red[0], green[120],
                       blue[240]
with all the intermediate colours in
between.

L: height in the cone : 0.0 black
to 1.0 white.
S: distance from center of cone :
1.0 saturated
colours to 0.0 grey, achromatic colours.
3'600'000 can be displayed at field limits.
