[Radiance-general] Tonemapping code...

[Erik Brännlund]

Hi!

I have tried to implement the tonemapping but the radiance site seems to
be down so I can't looak at all the code. All I have is tonemap.*. I
have managed to get something which compiles and runs but I seem to get
a linear mapping.
Either my code is wrong, likely.
Or the data I send into the mapping is wrong, even "likelier".

This is how it is done.
 Read an HDR file
     Convert RGBE data like this
        Procedure rgbe2float(var red, green, blue : Double; rgbe :
rgbetype);
        var
          f : double;
        begin
          if (rgbe[3] <> 0) then
          begin  //nonzero pixel
            f := power(2,rgbe[3]-(128+8));
            red := rgbe[0] * f;
            green := rgbe[1] * f;
            blue := rgbe[2] * f;
          end
          else
          begin
            red := 0;
            green := 0;
            blue := 0.0;
          end;
        end;

For all pixels in image
  Get RGB as float values
  Convert to XYZ
  Y := Y * 100;
  If Y = 0 then
    Y := 1e-4
  AddToHist(Y);

ComputeMap

For all pixels in image
  Get RGB as float values
  Convert to XYZ
  Y := Y * 100;
  If Y = 0 then
    Y := 1e-4
  Map(X, Y, Z);

Am I totally wrong here or?

Many thanx in advance/Erik