[Bf-committers] Color management broken?

Andrew Hunter andrew at aehunter.net
Sat Jul 13 18:21:20 CEST 2013

Hi Sergey,

On Jul 10, 2013 4:34 AM, "Sergey Sharybin" <sergey.vfx at gmail.com> wrote:
> Render engine should be a black box for the pipeline actually, it could
> any color space, any alpha mode it wants to. But when result goes out from
> the engine to the pipeline it shall stick to current color management.

Could you clarify what you mean my this?

> Which means if Scene Linear is set to ACES, render result need to be
> converted to ACES space before it's used in compositor or getting saved to
> the file.

If the render result needs to be converted to ACES, then the renderer is
not a black box if scene linear is ACES. Am I misunderstanding what you are

> Color picker is also kind of an issue, but it's not as much biggie.
> Currently it's just using some kind of approximation of ColorPicker space
> by assuming default View of display transform is always invertible and
> it for picking the color. Works reasonably fine, and does not bother
> artists being with extra options which are just confusing for 95% of
> blender artists.

"normal" is contextual.

> Agree those are indeed bigger tasks (comparing with just adding color
> conversion on file save), but we don't choose easy way, we d choose the
> right way.

As I understand it, Exr renders from blender are unsuitable for exchange
with other applications without first taking into account the peculiar
notion that float buffers must be saved to disk untransformed.

That isn't what I would call the "right" way.

> On Wed, Jul 10, 2013 at 6:10 AM, Troy Sobotka <troy.sobotka at gmail.com
> > On Jul 9, 2013 1:15 PM, "Sergey Sharybin" <sergey.vfx at gmail.com> wrote:
> > >The root of the issue goes to the fact, that renderer always
> > > outputs stuff in rec709 space (or in your language it'll be linear
> > > with rec709 primaries).
> >
> > ?
> >
> > The renderer only renders with the values assigned, no?
> >
> > Given that out color picker has yet to get proper management, this still
> > seems like a curious statement given that we can color light to any
> > under assumed primaries?
> >
> > With respect,
> > TJS
> > _______________________________________________
> > Bf-committers mailing list
> > Bf-committers at blender.org
> > http://lists.blender.org/mailman/listinfo/bf-committers
> >
> --
> With best regards, Sergey Sharybin
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