Full color laser or white lasers :
These generally use three lasers that are red, green and blue. They are
combined into a single beam. If all lasers are at full power, the combined beam is
white. By controlling how much red, green or blue is added, the beam becomes different
colors..
16.7 million colors - Most full-color projectors use analog modulation of the red,green
and blue lasers. There are 256 levels of each color, giving 256 x 256 x 256 or 16.7
million different shades. Analog modulation also allows gradual dimming of the colors,
so the graphics can fade in or out.
7 different colors -A few full-color projectors use only TTL on-off modulation of
the red,green and blue lasers. There are two levels of each color, on or off, giving
seven colors: red, yellow, green, cyan,blue, magenta and white. It is not possible
to have in-between shades, or to have gradual dimming. A color is either on or off.
Red - green lasers :
These have two laser colors, red and green. If the redand green are mixed
in varying amounts, you can get orange,yellow, and yellow-green shades..
65 536 different colors - Using analog modulation, the redand green can each be set
to one of 256 different levels. This gives 256 x 256 or 65,536 different shades.
Analog modulation also allows gradual dimming of the colors, so the graphics can
fade in and out..
3 different colors - the red and green lasers are turned on or off by TTL modulation.
There are three possible color combinations: red, yellow and green. It is not possible
to have in-between shades, or to have gradual dimming. A color is either on or off.
2 different colors - Another projector design has two laser colors,red and green.
However, only one color at a time can be used. So any given part of a graphic or
beam display is either red or green. There is no color mixing or dimming..
Single color lasers:
These use just one laser. The laser is a particular color, such as red,
or green, or cyan, or blue , or gold. This color cannot be changed in any way. Because
of how the eye works, colors in the center of the spectrum -- yellow, green, cyan
-- appear brighter than equal amounts of end colors -- red,orange, blue,magenta and
violet.
