Perhaps subject and some words are not the best - it's my English ...

I want achive color (1-Color) in this script :

  #macro NegativeTexture(Color)
    texture{pigment{color rgb (1-Color)}}
  #end
  #declare Color=color rgb 1;
  background{color Color}
  object{MyObject NegativeTexture(Color)

and this cause MyObject invisible
and cause warning: Suspicious expression after rgb.
But after changing inside macro :

  #macro NegativeTexture(Color)
    #local MaxColor=color rgb 1;
    texture{pigment{color rgb (MaxColor-Color)}}
  #end

rendering is fine but still with the same warning.
Is there any way to remove this warning ?
Is there any other proper way to calculate "negation" of color ?

ABX

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