When I don't specify any gamma settings, I get a bright image. POV-Ray preview
window shows it bright, window explorer show it bright, gimp and firefox too. So
I guess the file is easy to read and everyone get it right.

Now, I put the two gamma options I said earlier : File_Gamma=1 and
Display_Gamma=1.
POV-Ray preview show a darker image, like one I would get with #version 3.6;
Windows explorer and the Gimp also show the darker image.
Firefox shows a bright image.

This makes think firefox is the one to do it the wrong way... Am I wrong ?

Also, I still don't understand when and why identical values to File_Gamma and
Display_Gamma could lead to differences between the POV-Ray preview and the
resulting file...

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