Peter Popov wrote:
> 
> Right now I am using assumed_gamma 1.0 and Display_Gamma 2.3, output
> to PNG (3.5 b7).

This will produce realistic representation of the scene on your display.
PNG in b7 is broken so some software may not display the image correctly.

The default values of brightness and gray_threshold are the correct ones
for the overall energy distribution so no need to touch those. The other
radiosity parameters can be tweked to remove artefacts, for speed/quality
control etc.

To produce the optimal image with these settings without post processing
you will have to design the scene and lighting so that the contrast ratio
is 1:10 to 1:100. Sounds complicated? It's not. Just design the scene
so that the preview looks good :) It's quite like what photographers do
in studio when shooting for media with limited contrast ratio, like
newspaper or magazine.

I would recommend sticking to the "assumed_gamma 1, don't touch
brightness or gray_threshold"-rule for beginners. When deviating
from this rule without knowing the exact reason you are just shooting
yourself in the foot :)


BTW, some time ago a Blender user wanted to know how povray can
render the Cornell reference so close to the original and what
settings were used. I sent him cornell.pov and he used RGB values
and other relevant setting from the pov file to produce this:
http://ourworld.compuserve.com/homepages/scorpius/blender_radiosity.htm
For some reason povray isn't mentioned on the page :)


_____________
Kari Kivisalo

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