TRANSPARENCY command
Toggles the transparency of monotone images.
                Description
When transparency is turned on, the background color of the image is transparent.
Note: To change the transparency of entities use the
                    transparency property in the Layer and Properties panels.
            Note: This command only works with raster images attached to
                    the drawing that have a monochrome palette.
            Options within the command
- ON
 - Turns on transparency.
 
- OFF
 - Turns off transparency.