Re: [Openexr-devel] OpenEXR Data Channel Configurations

[Florian Kainz]

In addition to Paul's sample code, you may want to take a look at
"Reading and Writing OpenEXR Image Files with the IlmImf Library"
(at http://www.openexr.com/api.html, printer-friendly version at
http://www.openexr.com/api.print.html).
Section 2 covers reading and writing files with an arbitrary set
of channels. (The text assumes that you've already read section 1.)
Section 2.5 shows how to examine the channel list.

Florian

Chris Cox wrote:
> I'd be interested in seeing that sample code as well.
>
> Chris
>
>
> At 1:09 PM -0800 11/12/04, Paul Schneider wrote:
>
> > Hi, Angus,
> >
> > the RGBA interfaces exist as conveniences, for developers who don't 
> > need to support aux channels.  If you have an application that can 
> > understand more than RGBA, then you shouldn't use the RGBA interfaces; 
> > instead, use InputFile and OutputFile to get all of the channels, and 
> > examine the Header to see which channels exist.  I can send you some 
> > sample code offline if you wish.
> >
> > I imagine that RGBA+aux EXRs will become more and more common, as 
> > studios move to a deep-buffer workflow, but this of course will vary 
> > from facility to facility.
> >
> > - Paul
> >
> >
> > On Nov 12, 2004, at 12:55 PM, Angus Taggart wrote:
> >
> > > Hi,
> > >
> > > Is it common for facilities to create OpenEXR files that contain both 
> > > standard RGBA data and auxiliary data channels (e.g. normal vector 
> > > data and motion vector data)?  The reason that I ask is that the 
> > > OpenEXR library provides specialized classes for handling scanline 
> > > and tiled RGBA files and I was wondering what the recommended 
> > > approach would be to handling files that contain RGBA+aux data.
> > >
> > > Thanks,
> > > Angus
> > >
> > >
> > >
> > > ------------------------------------
> > > Angus Taggart
> > > Apple R&D, Santa Monica
> > >
> > >
> > >
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> >
> >
> >
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