QuickShow FB3-QS User Manual page 25

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The Beam Attenuation Map is a 64 by 64 "pixel" brightness control map. Each pixel can be set to any
brightness level from 0 to 100%. Rudimentary tools are provided to sample a brightness level in the
map, fill the entire map with the selected brightness level, fill a rectangular area with the selected
brightness level and freehand-draw brightness levels into the map.
The Beam Attenuation Map can be used for graphics, atmospheric and beam effects.
Example Beam Attenuation Map use with laser graphics
One common graphics use would be to prevent scanning above or below a certain point. For example,
lets say that you were projecting laser graphics over a standard television screen with a 4:3 aspect ratio.
Since the laser typically has a 1:1 aspect ratio, this would mean that the graphics could possibly scan
above the top or below the bottom of the screen. You can use the Beam Attenuation Map to make sure
that the brightness at the top and bottom of the screen is zero.