>   #declare Ofun_Norm=
>   function{
>     max
>     (
>     select(abs(Ifun_green_blur(x,y,z)-Ifun(x,y,z).green)-Di_Dist,0,1),
>     select(abs(Ifun_blue_blur(x,y,z)-Ifun(x,y,z).blue)-Di_Dist,0,1)
>     )
>   }
>

This has to be:

#declare Ofun_Norm=
  function{
    max
    (
    select(abs(Ifun_green_blur(x,y,z)-Ifun(x,y,z).green)-Di_Norm,0,1),
    select(abs(Ifun_blue_blur(x,y,z)-Ifun(x,y,z).blue)-Di_Norm,0,1)
    )
  }

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