Sepia:

   #declare sepia_amount=0.7;
   tonemapping {
     parameters { red,green,blue}
     function(r,g,b,x,y) 
{r*(1-sepia_amount)+min(1,r*(.393/2.2)+g*(.769/2.2)+b*.189)*sepia_amount}
     function(r,g,b,x,y) 
{g*(1-sepia_amount)+min(1,r*(.349/2.2)+g*(.686/2.2)+b*.168)*sepia_amount}
     function(r,g,b,x,y) 
{b*(1-sepia_amount)+min(1,r*(.272/2.2)+g*(.534/2.2)+b*.131)*sepia_amount}
   }

--
jaime

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