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Comparing ray/doc/notes/gamma_corr (file contents):
Revision 1.1 by greg, Sat Mar 15 17:32:55 2003 UTC vs.
Revision 1.2 by greg, Thu Jan 1 19:31:45 2004 UTC

# Line 15 | Line 15 | Most of the Radiance display drivers look at an enviro
15   called "DISPLAY_GAMMA" to determine how to set the gamma correction for the
16   current monitor.  Many programs also have a -g option for setting the
17   gamma value explicitly, but the environment variable is the only way to
18 < control gamma correction for rview, for example.
18 > control gamma correction for rvu, for example.
19  
20   To determine the approximate gamma for your monitor, display of the
21   distributed picture file ray/lib/lib/gamma.pic like so:

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