Two renders of the same scene, the top with gamma correction and the bottom
without.  The rightmost pixels of each sphere are only 5% apart (244 vs.
232) but gamma correction makes the top light source seem much brighter.

For the discussion with similar subject in p.g. at
http://news.povray.org/povray.general/thread/%3Cweb.439a1b692d1f46002a1c213f0%40news.povray.org%3E/

I'm not making a point about which is right or wrong, just doing a little
excercise.

global_settings { assumed_gamma 1 }  // or not...
sphere {0 1
  texture {
    finish {ambient 0 diffuse 1}
    pigment {rgb 1}
  }
}
light_source { <100, 0, 0> rgb 1}
camera {location -3*z look_at 0}

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