How can I easily modyfi colors in HDRI image?

More exacly - I can not have 100% white background in render, so I want to 
convert RGB > .95 .95 .95   into   .95 .95 .9x  so that bright white will 
became bright-blue.

If there isnt any other way I can postprocess final image, but maybe...

Btw - it would be greate to specify in addition to

no_image / no_reflection / no_shadow a parameter no_radiosity and 
only_radiosity 

that will allow i.e. to create extreamly bright object (for radiosity 
calculations) that yet will not be so bright when looking at it 

// to lightup sorroundings:
  sphere { 0 1 finish { ambient 10000 } only_radiosity } 

// this will be visible
  object { MyLamp texture {...} no_radiosity } 

I assume that sphere is a little bigger then lamp so lamp will not block 
it, but maybe an additional no_radiosity_shadow would also help ?

  object { MyLamp texture {...} no_radiosity no_radiosity_shadow } 



-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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