Gilles Tran schrieb:
> 
> A very useful feature that goes hand in hand with full area lights is color 
> mapping aka tone mapping aka exposure control. There's already some code for 
> it in Megapov. Basically one needs 3 modes : linear, exponential and HSV 
> (plus gamma correction and some others).
> [...]

Just because a certain renderer offer such three predefined modes does 
not make it a particularly good choice i think.  MegaPOV gives you the 
option of defining any tone mapping function although this currently is 
limited to  a 1D function identical for all color channels.  It might be 
interesting to make this a more general feature allowing full control 
over the mapping in all three color channels or alternatively integrate 
a color management system like LCMS.  It is questionable however 
considering the design of POV-Ray that having this as part of the 
renderer would be particularly useful.  Usually you want to be able to 
control color mapping after the render.  One practical problem about 
doing this separately is that a lot of current software designed for 
such purposes is developed for digital photo processing and often not 
able to load other input images than raw files from digital cameras.

-- Christoph

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