Alain <ele### [at] netscapenet> wrote:

> If I remember corectly, if you DON'T include "assumed_gamma" then your PNG don't
> include gamma information. Correct me if I'm wrong.

I think I'm going to have to correct you there Alain.  PNGs generated with
POV-Ray 3.6.1 on Linux include gamma information (a gAMA chunk) whether the
source file contains assumed_gamma or not.

However your suggestion led me to discover the cause of one of my problems:
the value in the gAMA chunk in the PNG is set to 1.0 if a CPU histogram is
generated with +HTx.  It should be set to 1/display_gamma.

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