[Bf-cycles] (un)Premultiplyed render passes

[Adriano Oliveira]

Yes,
My problem seams to be related do the need to use "UnMult" checkbox in
ExtractoR (the After plugin thar reeds passes from Multilayres EXR files)
for some layers.
My bug.

Adriano A. Oliveira


2014-02-28 18:09 GMT-03:00 Brecht Van Lommel <brechtvanlommel at pandora.be>:

> It works in Blender, so you should be able to get this working in
> After Effects too. I'm not familiar with AE or what kind of setup you
> created there exactly, so I can't make any specific suggestion for how
> to fix it.
>
> But as far as I know, the way Cycles is storing these passes is
> similar to other renderers (for example V-Ray), so I see no reason to
> change it.
>
> Brecht.
>
> On Fri, Feb 28, 2014 at 9:47 PM, Adriano Oliveira
> <adriano.ufrb at gmail.com> wrote:
> > Brecht,
> >
> > I have tried to reproduce the combining operetions over a rendered
> > Multilayer EXR in After Effects.
> > Unfortunatly I got a light black halo.
> >
> > The combined pass within the same EXR does not have the black halo.
> >
> > I think that Color passes should also be normalized. Same for AO and
> Shadow
> > passes.
> >
> > Adriano A. Oliveira
> >
> >
> > 2014-02-28 16:55 GMT-03:00 Adriano Oliveira <adriano.ufrb at gmail.com>:
> >
> >> Got it!
> >> Thank you.
> >>
> >>
> >> Adriano A. Oliveira
> >>
> >>
> >> 2014-02-28 11:23 GMT-03:00 Brecht Van Lommel <
> brechtvanlommel at pandora.be>:
> >>
> >>> If you combine the passes as shown in the graph there will be no halo,
> >>> the output will already be premultiplied.
> >>>
> >>> You would then use the Set Alpha node to give it an alpha channel. (I'm
> >>> not sure if that is what you mean by "applying" the alpha channel, you
> >>> should not be multiplying it in anyway, only setting it).
> >>>
> >>> Also, black halos are a sign that you have premultiplied when you
> >>> shouldn't, it's white halos that you see when you forget to
> premultiply.
> >>>
> >>> On Feb 28, 2014 1:10 PM, "Adriano Oliveira" <adriano.ufrb at gmail.com>
> >>> wrote:
> >>> >
> >>> > But as long as color passes are not premultyplied, you will get a
> black
> >>> > halo when applyig alpha to the final image, don't you?
> >>> >
> >>> >
> >>> > Adriano A. Oliveira
> >>> >
> >>> > Livro: http://goo.gl/WtcNX
> >>> > Lattes: http://lattes.cnpq.br/8343393957854863
> >>> > Blog "Anodinidades": http://anodinidades.wordpress.com/
> >>> > Produções audiovisuais: http://vimeo.com/anodinidades/videos
> >>> > Fotografia: http://www.flickr.com/photos/adriano-ol/
> >>> > Facebook: http://www.facebook.com/adriano.ol
> >>> > Twitter: http://twitter.com/anodinidades
> >>> >
> >>> >
> >>> > 2014-02-28 1:14 GMT-03:00 Daniel Salazar - patazstudio.com
> >>> > <zanqdo at gmail.com>:
> >>> >
> >>> >> Hi, this is no bug, here's the correct way to recompose the passes
> >>> >>
> >>> >>
> >>> >>
> http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Passes#Combining
> >>> >> Daniel Salazar
> >>> >> patazstudio.com
> >>> >>
> >>> >>
> >>> >> On Thu, Feb 27, 2014 at 9:41 PM, Adriano Oliveira
> >>> >> <adriano.ufrb at gmail.com> wrote:
> >>> >> > BUILD: b5d6f14
> >>> >> >
> >>> >> > I don't know if this is a bug or not, but I am rendering dufuse
> and
> >>> >> > glossy
> >>> >> > passes (direct, indirect, color) and I have noticed that some are
> >>> >> > premultiplied (likre indirect) and others are not (like color).
> >>> >> >
> >>> >> > This seams to be inconsistent.
> >>> >> >
> >>> >> > Adriano A. Oliveira
> >>> >> >
> >>> >> > _______________________________________________
> >>> >> > Bf-cycles mailing list
> >>> >> > Bf-cycles at blender.org
> >>> >> > http://lists.blender.org/mailman/listinfo/bf-cycles
> >>> >> >
> >>> >> _______________________________________________
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> >>> >> Bf-cycles at blender.org
> >>> >> http://lists.blender.org/mailman/listinfo/bf-cycles
> >>> >
> >>> >
> >>> >
> >>> > _______________________________________________
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> >>> > http://lists.blender.org/mailman/listinfo/bf-cycles
> >>> >
> >>>
> >>>
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> >>>
> >>
> >
> >
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