I di da new test with my demo-file, this time setting ambient_light 0, and then
changing the Assumed Gamma Value, I did tests on theese settings:
// assumed_gamma 0.5 //Gamma off
assumed_gamma 0.5
assumed_gamma 1.0
assumed_gamma 1.8
assumed_gamma 2.2

The differences are clear, and the most noteworthy difference is the green
lights shadow on the images(It's "lacking" in the macro BW image) as well as a
highlight that is larger in the macro version. other than this, the blue box are
in different shades of black, but not as noteworthy as the difference in the
background. 
I can post the images if you wish.(5*2 files)


-- 
//Spider 
( spi### [at] bahnhofse ) [ http://www.bahnhof.se/~spider/ ]
#declare life = rand(seed(42))*sqrt(-1);

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