Might also be a good idea to forego that filter 1 and use just transmit in a 
loop, like so:

#local Tc=0;
#while (Tc<128)
transmit Tc, 1
#local Tc=Tc+1;
#end

Need to convert to a paletted image first, of course, one with the lightest 
indices going from either 255 downward or 0 upward. Then adjust the loop 
test number up or down to what looks best. The above works for white at 255 
and gray at 128.

Negative diffuse alone should cause opposite of usual. Darker perpendicular 
to a light source and brighter the more parallel the surface gets to the 
light source. But I wasn't getting anything looking right using what you 
had.
I put no_shadow into the nighttime lights sphere, too, but that probably 
isn't needed.
-- 
/*bob hughes*/

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