Re: [Openexr-devel] Quicktime & YUV

[Drew Hess]

A Quicktime plugin for OpenEXR would be great.

Assuming you're dealing with YUV video, the details of the YUV->RGB matrix
are dependent on the video standard.  There's ccir601, rec709, etc.

For this reason (and others), I think that colorspace conversion should be
handled outside of OpenEXR.  That's the domain of the application.  But
what OpenEXR does need is better handling of subsampled images (e.g.
YUV422).  See the document in the doc/ directory of the distribution for
more details of what's there and what's missing.


-dwh-


 On Thu, 23 Jan 2003, harlan wrote:

> Yeah, precisely.  A Quicktime plugin for OpenEXR, essentially allowing 
> any Quicktime app to import/export an OpenEXR frame or sequence of 
> frames.  There are a few awkward issues with Quicktime, but think they 
> can be overcome easily.  We'll definitely be looking into it since 
> Quicktime serves as a large part of our pipeline.
> 
> On another note, we're more than happy to help out with YUV support for 
> OpenEXR.  I'm not sure if anyone here has done much work with RGB to 
> YUV color conversion, but I believe the accepted floating-point 
> equation for RGB to YUV conversion is:
> 
> Y =   0.299R        0.587G   +   0.114B
> U =  -0.146R   -   0.288G   +   0.434B
> V =   0.617R    -   0.517G   -   0.100B
> 
> correct?  anyone?  bueler......bueler???
> 
> c'ya
> 
> harlan
> Twilight Entertainment
> address@hidden
> 
> On Thursday, January 23, 2003, at 02:11  PM, Drew Hess wrote:
> 
> >
> > Hi Harlan, glad you like OpenEXR.
> >
> > Nobody I know of is working on a Quicktime plugin for OpenEXR (I assume
> > that's what you're talking about, not support for generating Quicktime
> > files from OpenEXR itself?), so if you'd like to give it a go, please 
> > do.
> > Sounds really cool.
> >
> >
> > -dwh-
> >
> >
> >
> > On Thu, 23 Jan 2003, harlan wrote:
> >
> >> Has anybody given thought to a Quicktime I/O for OpenEXR?  If not,
> >> we're looking at putting one together, but kind of wanted to see if
> >> anyone else was doing anything similar before jumping in head first.
> >>
> >> By the way, thanks so much for OpenEXR - I've 'wasted' two complete
> >> days playing around and digging through it.  :)  Pretty cool!
> >>
> >> Take care all,
> >>
> >> Harlan
> >> Twilight Entertainment
> >> address@hidden
> >>
> >>
> >>
> >> _______________________________________________
> >> Openexr-devel mailing list
> >> address@hidden
> >> http://mail.nongnu.org/mailman/listinfo/openexr-devel
> >>
> >
> > .
> >
> 
>