Re: [Openexr-devel] More documentation coming? Questioins on writing files etc...

[Mr 'Zap' Andersson]

On Stardate 27 Jan 2003, 22:37, subspace transmissions from Drew Hess 
<address@hidden> indicated:  

> > Good. Is there some more documentation coming? I find this slightly
> > underdocumented. While I can decode the usage of reading from the display
> > app, the usage for writing kinda eludes me. Especially since I would like
> > to be able to export as many channgls as MAX supports...
> 
> There were a few emails that went out last week about writing OpenEXR
> images.  I'll mail them to you privately.

Cool.

Other query: If I use the class for importing RGBA data, will that be 
confused if the file contains MORE than just RGBA?
 
> > Also... should I implement any of this deblur, knee etc. stuff in the
> > import, or should I simply import the data as-is and let the existing MAX
> > functions for tweaking response curves do that job instead? As I feel
> > those functions are kinda meant for DISPLAY anyway... right?
> 
> Yeah, those functions are for display, but if MAX expects image data to be
> "cooked" for display, you'll need to apply at least a gamma curve to get
> them into the display space that MAX expects.

No max expects it's image data to "know" it's gamma (and applies a 
configurable default to file formats that lack this info), and applies 
gamma correction for display (although this can be disabled if one wants 
to). So telling max the file's gamma is 1.0 should do the trick.

However, I am having compile trouble (VC7 doesnt like the headers and goes 
crazy, even though I did grab a version supposedly "msvc" fixed from the 
list) so I'm kinda stuck waiting for an "official" works-with-vc-7 release.


Are there more "defined" OpenEXR channels?

I'm planning to output as many channels that I can squeeze out of max, 
i.e. z, pixel velocity vectors, UVW, normals... the lot. But I see that 
only "R", "G", "B" and "A" is defined. Are there any preexisting "de 
facto" standards for channel names and their definition - if even within 
ILM - for stuff like UVW coordinates, surface normals, surface ID's, etc?

/Z
 
> 
> 
> -dwh-
> 
> 
> 
> 
> _______________________________________________
> Openexr-devel mailing list
> address@hidden
> http://mail.nongnu.org/mailman/listinfo/openexr-devel


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