AW: [Openexr-devel] Missing include - and other questions...

[Matthias Biedermann]

Hi folks,


thanks for your quick answers!

Well, I've already investigated into that tone-mapping stuff and have
found Reinhard's technique implemented in your toolset "exrtools",
Billy. 
However, the tonemapping needed for my work (which will finish in the
midst of June...) is just for displaying the HDR as textures, so
"business as usual". The "problem" is that tonemapping is not the main
focus of my thesis and thus doesn't have to be very sophisticated but
rapid. As I'm dynamically rendering HDR-cubemaps in moving/interactive
scenes lit by a static (but rotateable/exchangeable) HDR-lightprobe
there is not much time to use clever multipass operators and such - the
GPU will have enough fun with the spherical harmonics anyway...;->

So if you can recommend or tell about experiences with some fast global
tonemapping operators like some sort of log-mapping
(Weber-Fechner's-law, global step of Reinhard's) or (N)URQV, I'd be
happy about any information!


Bye,
Matthias




> -----Ursprüngliche Nachricht-----
> Von: Billy Biggs [mailto:address@hidden 
> Gesendet: Montag, 26. Januar 2004 21:46
> An: Matthias Biedermann
> Cc: address@hidden
> Betreff: Re: [Openexr-devel] Missing include - and other questions...
> 
> 
> Florian Kainz (address@hidden):
> 
> > > btw: I'm very delighted to have found such a flexible and 
> extensible 
> > > open-source tool for handling HDR-images as I need them 
> (along with 
> > > other stuff) in my diploma thesis. Is there already more 
> information 
> > > available for using OpenEXR with dynamic rendering of cubemaps as 
> > > XXXXX has asked ...? Or some general "paper"-stuff about 
> OpenEXR and 
> > > its concepts (like tonemapping etc.) to use for citations?
> > 
> > [...]
> >
> > No tone-mapping techniques I know of depend on a particular 
> image file 
> > format.  The only requirement is, of course, that the input 
> files must 
> > be able to represent the image's full dynamic range.  For various 
> > papers about tone mapping, check the SIGGRAPH proceedings 
> from 1998 to 
> > 2003.
> 
>   Techniques don't depend on a file format, but implementations
> sometimes do. ;-)   I implement some tone mapping algorithms in
> exrtools, and will post improved versions soon.
> 
  http://scanline.ca/exrtools/

  -Billy