Thank you Christoph, this is more than satisfying and as a consequence I 
can leave out the gammas in the standard material files I provide for my 
Poser characters.

I would need to test it, but I guess that height_fields based on an 
image_map function may still need the gamma mention to render correctly:

function {
   pigment {
     image_map {
       tga "MyImage.tga" gamma 1.0
       map_type 0
       interpolate 2
     }
   }
}

Omitting this in the past gave different height_field results [from 
2009-2010 onwards].

Thomas

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