[Bf-compositor] Clamping (Mix, Math, RGB Curves)
Francesco Paglia
f.paglia.80 at gmail.com
Sun May 25 09:50:01 CEST 2014
Thanks for the advices Diego and David!
Just a little thought:
Adding lot of nodegroups in a single "category" - I mean in the same menu
list - isn't that efficient... is there a way to manage their position in
the SHIFT+A menu?
Referenced node group are quite "risky" since compositing session works
most likely WYSIWYG and as soon as you change something you have to check
back each project... but I get your point Diego... I'm very used to linked
group, they are so useful and I hope they will be empowered a lot with
gooseberry since Proxyfication have room for for lot of improvement.
2014-05-25 4:26 GMT+02:00 David McSween <3pointedit at gmail.com>:
> Don't forget the addon Node Presets
> http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Compositing/Compositing_PresetsI think you can add node groups and store them in a portable file.
> On 25 May 2014 09:59, "Diego Gangl" <dnicolas at gmail.com> wrote:
>
>> >> It is possible to clamp (blacks and whites individually even), but
>> >> whenever I want to do it I have to add gazillion nodes. It takes time.
>> My
>> >> intention is to make it with a single click.
>>
>> You can turn them into a group, plug the math values into group
>> inputs, name it and bam! your own Clamp Node that you can add from the
>> group menu.
>>
>> > Isn't there a way to develop few nodegroup store them somewhere and
>> recall
>> > them in a personal group list or add them in the lists we already have?
>>
>> There's two ways:
>>
>> 1- Make the groups in a new (empty) blend file, then save it as your
>> start-up file (ctrl+U). The node groups will be available in every new
>> file you make.
>>
>> 2- Make a "Node Library" file. Make all your groups there, then make a
>> new empty file and link all the groups from the library file. Save it
>> as your start-up file and you get all the groups. The cool thing is
>> that if you tweak the groups inside the lib file, they will be upated
>> in all the blend files that link them.
>>
>> Gooseberry is going to bring a lot of developement into asset
>> management, so it will get better.
>>
>>
>> 2014-05-24 7:00 GMT-03:00 Francesco Paglia <f.paglia.80 at gmail.com>:
>> > Isn't there a way to develop few nodegroup store them somewhere and
>> recall
>> > them in a personal group list or add them in the lists we already have?
>> > Could it be a python add-on?
>> > This would help us skip the tedious part of reloading those node every
>> time
>> > a new blend file is created and also could help us distribute those
>> nodes in
>> > their coherent place.
>> >
>> >
>> >
>> > 2014-05-24 11:31 GMT+02:00 Bartek Skorupa (priv)
>> > <bartekskorupa at bartekskorupa.com>:
>> >
>> >> It is possible to clamp (blacks and whites individually even), but
>> >> whenever I want to do it I have to add gazillion nodes. It takes time.
>> My
>> >> intention is to make it with a single click.
>> >> How much time did it take you to set up this fantastic node tree of
>> yours?
>> >> If it's more than one second - itś too much. It should be: Decision =>
>> 1
>> >> second later: DONE.
>> >>
>> >>
>> >> Bartek Skorupa
>> >>
>> >> www.bartekskorupa.com
>> >>
>> >> On 24 maj 2014, at 00:10, Sean Kennedy <mack_dadd2 at hotmail.com> wrote:
>> >>
>> >> Ah, great idea! We could even set one up with RGB, one on each channel,
>> >> and save it as a nodegroup.
>> >> Thanks! So obvious, don't know why we didn't think of this. :)
>> >>
>> >> I'm going to set one up today.
>> >>
>> >> sean
>> >>
>> >> > From: dnicolas at gmail.com
>> >> > Date: Fri, 23 May 2014 19:07:28 -0300
>> >> > To: bf-compositor at blender.org
>> >> > Subject: Re: [Bf-compositor] Clamping (Mix, Math, RGB Curves)
>> >> >
>> >> > Hi all, I don't know how Blender's handles colors internally but
>> >> > wouldn't this work?
>> >> > http://www.pasteall.org/pic/show.php?id=71736
>> >> > (or are the V values already mapped to 0-1 from the separate node?)
>> >> >
>> >> > Cheers,
>> >> >
>> >> > 2014-05-23 18:46 GMT-03:00 Sean Kennedy <mack_dadd2 at hotmail.com>:
>> >> > > Could we set the value of the clamp? It could come in as defaults
>> of
>> >> > > 1.0 and
>> >> > > 0.0, but we could alter it to whatever we wanted. At R&H, most of
>> the
>> >> > > time
>> >> > > we clamped brights around 14-16. We'd only turn it down under that
>> if
>> >> > > we got
>> >> > > bad pixels when rendering.
>> >> > >
>> >> > > If you had a superbright red, like R 12, G 3, B 4, and you put a
>> clamp
>> >> > > of 1
>> >> > > on it, obviously it's going to set each value to 1, so what was red
>> >> > > now
>> >> > > reads as white. But it would still be useful.
>> >> > >
>> >> > > After Effects clamp tool
>> >> >
>> >> > > >
>> http://cdn.aescripts.com/media/catalog/product/cache/1/image/800x600/040ec09b1e35df139433887a97daa66f/f/t/ft-clamp-ui_1.png
>> >> > >
>> >> > > Nuke clamp is in the color grade node
>> >> >
>> >> > > >
>> http://docs.thefoundry.co.uk/nuke/63/pythondevguide/_images/getMinMax_01.png
>> >> > >
>> >> > > I'm not posting the images to say "this is how we should do it",
>> but
>> >> > > rather,
>> >> > > to say it is useful and professional compositors would indeed use
>> it
>> >> > > often.
>> >> > >
>> >> > > In fact, I was working on a shot this week that could have used
>> it. I
>> >> > > was
>> >> > > given stock footage from a client, and I have no idea how much
>> they'll
>> >> > > color
>> >> > > correct it in post once I deliver the final vfx shot. SO I have to
>> >> > > make sure
>> >> > > all my blacks are in line with what is in the plate. I put a gamma
>> on
>> >> > > the
>> >> > > plate just to view the black levels and see how they match up when
>> >> > > pushed
>> >> > > really far.
>> >> > >https://dl.dropboxusercontent.com/u/10553822/clamp_blacks_01.jpg
>> >> > >
>> >> > > Since we don't have a clamp, I ended up putting a mix node right
>> after
>> >> > > the
>> >> > > stock footage node, setting it to Lighten, and making the color
>> over
>> >> > > it
>> >> > > black. then I slowly raised it while watching until the blacks all
>> >> > > came in
>> >> > > line. Would have been much easier to sample the value of the
>> darkest
>> >> > > dark I
>> >> > > wanted in the shot, throw a clamp node on with the black clamp set
>> to
>> >> > > those
>> >> > > values.
>> >> > >
>> >> > > In fact, at R&H, the Black Clamp node let you set an individual
>> value
>> >> > > for R,
>> >> > > G, and B. And it had a color picker so you could just sample the
>> image
>> >> > > and
>> >> > > the values would fill in automatically.
>> >> > >
>> >> > > Anyway, just throwing out my $0.02. Obviously I've found a
>> workaround
>> >> > > and
>> >> > > can live with it, but it would sure be great to someday see a clamp
>> >> > > node.
>> >> > >
>> >> > > ________________________________
>> >> > > Date: Fri, 23 May 2014 14:21:40 -0700
>> >> > >
>> >> > > From: troy.sobotka at gmail.com
>> >> > > To: bf-compositor at blender.org
>> >> > > Subject: Re: [Bf-compositor] Clamping (Mix, Math, RGB Curves)
>> >> > >
>> >> > >
>> >> > > On May 23, 2014 1:56 PM, "Bartek Skorupa (priv)"
>> >> > > <bartekskorupa at bartekskorupa.com> wrote:
>> >> > >
>> >> > >> When I say: "clamp blacks" I always mean: set every value below
>> 0.0
>> >> > >> to
>> >> > >> 0.0.
>> >> > >> When I say: "clamp whites" I always mean: set every value above
>> 1.0
>> >> > >> to
>> >> > >> 1.0.
>> >> > >> Every compositing artist will know what I mean.
>> >> > >
>> >> > > If we can generate a clamp / scale node, I am all for it.
>> >> > >
>> >> > > I am saying there is no concept of white in a scene referred model,
>> >> > > and as
>> >> > > such, you have to be careful as to not write nodes that break the
>> >> > > system.
>> >> > >
>> >> > > It is that simple. No white. No brighter than white. So sorry,
>> “Every
>> >> > > artist...” is actually “Every artist unfamiliar with HDR work.”
>> >> > >
>> >> > > So a clamp node _must_ not make the erroneous assumption that 1.0
>> >> > > means
>> >> > > anything special, and rather provide for an arbitrary value range.
>> >> > >
>> >> > > If this all seems like speaking an alien language, it is precisely
>> why
>> >> > > I
>> >> > > chimed in and said “Whoa.”
>> >> > >
>> >> > > There are already nodes that are broken because of erroneous
>> >> > > assumptions. It
>> >> > > would be a shame to make more.
>> >> > >
>> >> > > With respect,
>> >> > > TJS
>> >> > >
>> >> > >
>> >> > > _______________________________________________ Bf-compositor
>> mailing
>> >> > > list
>> >> > > Bf-compositor at blender.org
>> >> > > http://lists.blender.org/mailman/listinfo/bf-compositor
>> >> > >
>> >> > > _______________________________________________
>> >> > > Bf-compositor mailing list
>> >> > > Bf-compositor at blender.org
>> >> > > http://lists.blender.org/mailman/listinfo/bf-compositor
>> >> > >
>> >> > _______________________________________________
>> >> > Bf-compositor mailing list
>> >> > Bf-compositor at blender.org
>> >> > http://lists.blender.org/mailman/listinfo/bf-compositor
>> >> _______________________________________________
>> >> Bf-compositor mailing list
>> >> Bf-compositor at blender.org
>> >> http://lists.blender.org/mailman/listinfo/bf-compositor
>> >>
>> >>
>> >>
>> >> _______________________________________________
>> >> Bf-compositor mailing list
>> >> Bf-compositor at blender.org
>> >> http://lists.blender.org/mailman/listinfo/bf-compositor
>> >>
>> >
>> >
>> >
>> > --
>> > Francesco Paglia
>> > Vfx and Production Supervisor
>> >
>> > mobile +39 347.82.12.473
>> > e-mail f.paglia.80 at gmail.com
>> >
>> >
>> > _______________________________________________
>> > Bf-compositor mailing list
>> > Bf-compositor at blender.org
>> > http://lists.blender.org/mailman/listinfo/bf-compositor
>> >
>> _______________________________________________
>> Bf-compositor mailing list
>> Bf-compositor at blender.org
>> http://lists.blender.org/mailman/listinfo/bf-compositor
>>
>
> _______________________________________________
> Bf-compositor mailing list
> Bf-compositor at blender.org
> http://lists.blender.org/mailman/listinfo/bf-compositor
>
>
--
Francesco Paglia
Vfx and Production Supervisor
mobile +39 347.82.12.473
e-mail f.paglia.80 at gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.blender.org/pipermail/bf-compositor/attachments/20140525/346e85fb/attachment-0001.htm
More information about the Bf-compositor
mailing list