Sorrry for not answering immediately, but I had a hardware problem....

The macro returns a 3 component vector:

#macro GammaColor (Color,Gamma)
  rgb <pow(Color.red,Gamma),pow(Color.green,Gamma),pow(Color.blue,Gamma)>
#end

Somehow, I got it to work now correctly - I don't know exactly how - but I 
guess that I had a kind of conflict of interest. I discovered that I called 
the macro twice and that may (?) have caused the problem... It is a bit 
frustrating that I cannot put exactly the finger on the sore spot, so to 
say... :(

Thanks a lot anyway, to Kenneth, Thorsten and Alain for their comments. They 
helped me to think less muddy :)

Thomas

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