Vignetting + Noise:

   #declare vignetting_amount=0.3;
   #declare noise_amount=0.05;
   #declare f_vignette=
   function{
     pigment{
       spherical
       color_map{
         [vignetting_amount rgb 0]
         [1 rgb 1]
       }
     }
   }
   tonemapping {
     parameters { channel,x,y }
     function(c,x,y) 
{c*f_vignette(x-.5,y-.5,0).gray-f_granite(.1+x*image_width,y*image_width,0)*noise_amount+f_granite(.2+x*image_width,y*image_width,0)*noise_amount}
   }

--
jaime

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