[Openexr-devel] magic numbers

[Peter Kümmel]

Hi all,

currently I'm reading the source code of exrdisplay,
and I'm wondering about where all the magic numbers
are coming from:

- 2^(exposure + 2.47393)

-       //
        // Map floating-point pixel values 0.0 and 1.0
        // to the display's white and black respectively.
        //

        exposure = 1.02607;
        defog = 0;
        kneeLow = 0.0;
        kneeHigh = 3.5;


Could someone point me to papers/books/explanations
how to map the half range to 0..255?

Many thanks,
Peter