Bob Hughes wrote:
> 
> I must be thinking of MegaPOV about some sort of contrast adjustments on the 
> scene renders. Seemed like someone here mentioned replacing assumed_gamma 
> with a way to do that instead, but I don't find anything said of it.

Since the MegaPOV tone mapping has been brought up in this context i 
like to point out a few things.

The tone mapping patch primarily allows to apply color adjustments prior 
to antialiasing (although it allows to specify them for post-aa as well) 
which can be useful for high quality results with more-than-subtle 
nonlinear adjustments.  This has been discussed in depth and no need to 
bring this up again.  The patch can be used to do exactly what 
assumed_gamma does (both before and after aa at your decision) and there 
is a macro in tone_mapping.inc (Gamma_Correct()) that does exactly this.

The display_gamma/assumed_gamma distinction does only make sense if 
assumed_gamma can be set in the scene file (and in this case there is no 
real point to restrict it to a gamma factor).  Without this two distinct 
gamma factors are confusing and should be replaced by a single one (for 
which both display_gamma and assumed_gamma would be misleading names).

Christoph

-- 
POV-Ray tutorials, include files, Landscape of the week:
http://www.tu-bs.de/~y0013390/ (Last updated 24 Jul. 2005)
MegaPOV with mechanics simulation: http://megapov.inetart.net/

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