[Nuke-users] Greenscreens from Hell.

[Manuel Gonzalez]

Hi all,


I am battling with the worst greenscreens shoots ever. In order to minimize all 
the awesome junk around the actor we have an animated garbage matte that is 
premult before feeding into the IBK. The result of the IBK gives a nice key.  
In the alpha of the IBK, inside the garbage mask I have the nice key, outside 
is white.   My question is, how to make the outside of that alpha black ?.  
Plate>Garbage Matte>Premult>IBK Colour>IBK Gizmo.  I can merge the plate back 
and do an inside, using the animated garbage matte as the holdout matte.  The 
thing that is confusing me is that, when I premult the plate, in the alpha the 
outside is already black(0), shouldn't the IBK just pass that value along and 
give that result plus the inside of the animated garbage matte ?.



Thanks,



Manuel Gonzalez
Just an old, old timer... 





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[Nuke-users] Greenscreens from Hell.

[Manuel Gonzalez]

Thanks for all the answers.


I usually don't like to premult before keying but this was a desperate measure 
for what hands down has to be the worst greenscreens I ever seen in my life, 
and boy I seen bad stuff before but this one takes the cake.  Thanks for all 
the input, I end up using Frank's suggestion it works like a charm.
Back to more greenscreen hell on St Patrick's day, what an irony !


Happy Green Beer day for you all  !!!.



Manuel Gonzalez


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Re: [Nuke-users] Greenscreens from Hell.

[chris]

hmm, i'm not a specialist with IBK, but generally i try to
avoid premultiplication of a matte before the key as it can
introduce dark edges around the mask.

try to first pull the key, then use a Merge(min) to combine
the (inverted) garbage matte alpha with the key alpha, then
do your premults if necessary.

obviously there are quite a few other ways depending on how
you like to work which will give you the same results..

++ chris


On 3/16/11 at 12:42 AM, nosweats...@earthlink.net (Manuel
Gonzalez) wrote:


Hi all,


I am battling with the worst greenscreens shoots ever. In order 
to minimize all the awesome junk around the actor we have an 
animated garbage matte that is premult before feeding into the 
IBK. The result of the IBK gives a nice key.  In the alpha of 
the IBK, inside the garbage mask I have the nice key, outside 
is white.   My question is, how to make the outside of that 
alpha black ?.  Plate>Garbage Matte>Premult>IBK Colour>IBK 
Gizmo.  I can merge the plate back and do an inside, using the 
animated garbage matte as the holdout matte.  The thing that is 
confusing me is that, when I premult the plate, in the alpha 
the outside is already black(0), shouldn't the IBK just pass 
that value along and give that result plus the inside of the 
animated garbage matte ?.




Thanks,




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Re: [Nuke-users] Greenscreens from Hell.

[Nick Guth]

I agree with Chris. Do your key without any premultiplication then you can
merge your animated mask in as stencil to cut out the parts that you don't
want anymore.

On Wed, Mar 16, 2011 at 5:40 PM, chris  wrote:

> hmm, i'm not a specialist with IBK, but generally i try to
> avoid premultiplication of a matte before the key as it can
> introduce dark edges around the mask.
>
> try to first pull the key, then use a Merge(min) to combine
> the (inverted) garbage matte alpha with the key alpha, then
> do your premults if necessary.
>
> obviously there are quite a few other ways depending on how
> you like to work which will give you the same results..
>
> ++ chris
>
>
> On 3/16/11 at 12:42 AM, nosweats...@earthlink.net (Manuel
>
> Gonzalez) wrote:
>
>  Hi all,
>>
>>
>> I am battling with the worst greenscreens shoots ever. In order to
>> minimize all the awesome junk around the actor we have an animated garbage
>> matte that is premult before feeding into the IBK. The result of the IBK
>> gives a nice key.  In the alpha of the IBK, inside the garbage mask I have
>> the nice key, outside is white.   My question is, how to make the outside of
>> that alpha black ?.  Plate>Garbage Matte>Premult>IBK Colour>IBK Gizmo.  I
>> can merge the plate back and do an inside, using the animated garbage matte
>> as the holdout matte.  The thing that is confusing me is that, when I
>> premult the plate, in the alpha the outside is already black(0), shouldn't
>> the IBK just pass that value along and give that result plus the inside of
>> the animated garbage matte ?.
>>
>>
>>
>> Thanks,
>>
>>
>>
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Re: [Nuke-users] Greenscreens from Hell.

[Ned Wilson]

Personally, I would use your animated garbage matte and merge it with 
the output of IBKColour using a Stencil operation. IBK assumes that 
whenever the output of IBKColour is black, alpha = 1.



Nick Guth wrote:

I agree with Chris. Do your key without any premultiplication then you can
merge your animated mask in as stencil to cut out the parts that you don't
want anymore.

On Wed, Mar 16, 2011 at 5:40 PM, chris  wrote:

  

hmm, i'm not a specialist with IBK, but generally i try to
avoid premultiplication of a matte before the key as it can
introduce dark edges around the mask.

try to first pull the key, then use a Merge(min) to combine
the (inverted) garbage matte alpha with the key alpha, then
do your premults if necessary.

obviously there are quite a few other ways depending on how
you like to work which will give you the same results..

++ chris


On 3/16/11 at 12:42 AM, nosweats...@earthlink.net (Manuel

Gonzalez) wrote:

 Hi all,


I am battling with the worst greenscreens shoots ever. In order to
minimize all the awesome junk around the actor we have an animated garbage
matte that is premult before feeding into the IBK. The result of the IBK
gives a nice key.  In the alpha of the IBK, inside the garbage mask I have
the nice key, outside is white.   My question is, how to make the outside of
that alpha black ?.  Plate>Garbage Matte>Premult>IBK Colour>IBK Gizmo.  I
can merge the plate back and do an inside, using the animated garbage matte
as the holdout matte.  The thing that is confusing me is that, when I
premult the plate, in the alpha the outside is already black(0), shouldn't
the IBK just pass that value along and give that result plus the inside of
the animated garbage matte ?.



Thanks,



  

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Re: [Nuke-users] Greenscreens from Hell.

[Frank Rueter]

just put a nice green through your garbage matte rather than premultiplying 
your colour with it.


On Mar 17, 2011, at 12:42 PM, Manuel Gonzalez wrote:

> Hi all,
> 
> 
> I am battling with the worst greenscreens shoots ever. In order to minimize 
> all the awesome junk around the actor we have an animated garbage matte that 
> is premult before feeding into the IBK. The result of the IBK gives a nice 
> key.  In the alpha of the IBK, inside the garbage mask I have the nice key, 
> outside is white.   My question is, how to make the outside of that alpha 
> black ?.  
> Plate>Garbage Matte>Premult>IBK Colour>IBK Gizmo.  I can merge the plate back 
> and do an inside, using the animated garbage matte as the holdout matte.  The 
> thing that is confusing me is that, when I premult the plate, in the alpha 
> the outside is already black(0), shouldn't the IBK just pass that value along 
> and give that result plus the inside of the animated garbage matte ?.
> 
> 
> 
> Thanks,
> 
> 
> 
> Manuel Gonzalez
> Just an old, old timer... 
> 
> 
> 
> 
> 
> ***
> "Support Bacteria;
> The only culture some people have."
> ___
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Re: [Nuke-users] Greenscreens from Hell.

[fredd hidef]

We should have a "Worst Green/Blue screens of our life" competition with
collection of screen dumps... Could be nice to show whining juniors :)

"Oh yeah, You think U have it bad? Well, boy, look at this!" haha

I surely have a few candidates...

//fredd

On Thu, Mar 17, 2011 at 3:47 PM, Manuel Gonzalez
wrote:

> Thanks for all the answers.
>
>
> I usually don't like to premult before keying but this was a desperate
> measure for what hands down has to be the worst greenscreens I ever seen in
> my life, and boy I seen bad stuff before but this one takes the cake.
>  Thanks for all the input, I end up using Frank's suggestion it works like a
> charm.
> Back to more greenscreen hell on St Patrick's day, what an irony !
>
>
> Happy Green Beer day for you all  !!!.
>
>
>
> Manuel Gonzalez
>
>
>
> ***
> "Support Bacteria;
> The only culture some people have."
> ___
> Nuke-users mailing list
> Nuke-users@support.thefoundry.co.uk
> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
>



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Re: [Nuke-users] Greenscreens from Hell.

[pixelcowbo...@gmail.com]

It should be divided in categories though, as almost 50% of SD video
greenscreens qualified.

On Fri, Mar 18, 2011 at 8:59 AM, fredd hidef  wrote:
> We should have a "Worst Green/Blue screens of our life" competition with
> collection of screen dumps... Could be nice to show whining juniors :)
> "Oh yeah, You think U have it bad? Well, boy, look at this!" haha
> I surely have a few candidates...
> //fredd
>
> On Thu, Mar 17, 2011 at 3:47 PM, Manuel Gonzalez 
> wrote:
>>
>> Thanks for all the answers.
>>
>>
>> I usually don't like to premult before keying but this was a desperate
>> measure for what hands down has to be the worst greenscreens I ever seen in
>> my life, and boy I seen bad stuff before but this one takes the cake.
>>  Thanks for all the input, I end up using Frank's suggestion it works like a
>> charm.
>> Back to more greenscreen hell on St Patrick's day, what an irony !
>>
>>
>> Happy Green Beer day for you all  !!!.
>>
>>
>>
>> Manuel Gonzalez
>>
>>
>>
>> ***
>> "Support Bacteria;
>> The only culture some people have."
>> ___
>> Nuke-users mailing list
>> Nuke-users@support.thefoundry.co.uk
>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
>
>
>
> --
> __
> Fredrik Pihl
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>
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Re: [Nuke-users] Greenscreens from Hell.

[Johan Boije]

Ah those good ol' chromas shot on DV.  And why not throw in the new black...
5D green screen :-)

On Fri, Mar 18, 2011 at 5:01 PM, pixelcowbo...@gmail.com <
pixelcowbo...@gmail.com> wrote:

> It should be divided in categories though, as almost 50% of SD video
> greenscreens qualified.
>
> On Fri, Mar 18, 2011 at 8:59 AM, fredd hidef  wrote:
> > We should have a "Worst Green/Blue screens of our life" competition with
> > collection of screen dumps... Could be nice to show whining juniors :)
> > "Oh yeah, You think U have it bad? Well, boy, look at this!" haha
> > I surely have a few candidates...
> > //fredd
> >
> > On Thu, Mar 17, 2011 at 3:47 PM, Manuel Gonzalez <
> nosweats...@earthlink.net>
> > wrote:
> >>
> >> Thanks for all the answers.
> >>
> >>
> >> I usually don't like to premult before keying but this was a desperate
> >> measure for what hands down has to be the worst greenscreens I ever seen
> in
> >> my life, and boy I seen bad stuff before but this one takes the cake.
> >>  Thanks for all the input, I end up using Frank's suggestion it works
> like a
> >> charm.
> >> Back to more greenscreen hell on St Patrick's day, what an irony !
> >>
> >>
> >> Happy Green Beer day for you all  !!!.
> >>
> >>
> >>
> >> Manuel Gonzalez
> >>
> >>
> >>
> >>
> ***
> >> "Support Bacteria;
> >> The only culture some people have."
> >> ___
> >> Nuke-users mailing list
> >> Nuke-users@support.thefoundry.co.uk
> >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
> >
> >
> >
> > --
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> > digital compositor
> > +46-708-559 559
> >
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Re: [Nuke-users] Greenscreens from Hell.

[Vincent Poitras]

haha funny I had my worst greenscreen ever not so long agonothing was 
keyable on itand i mean nothing!



On 2011-03-18, at 11:59 AM, fredd hidef wrote:

> We should have a "Worst Green/Blue screens of our life" competition with 
> collection of screen dumps... Could be nice to show whining juniors :)
> 
> "Oh yeah, You think U have it bad? Well, boy, look at this!" haha
> 
> I surely have a few candidates... 
> 
> //fredd
> 
> On Thu, Mar 17, 2011 at 3:47 PM, Manuel Gonzalez  
> wrote:
> Thanks for all the answers.
> 
> 
> I usually don't like to premult before keying but this was a desperate 
> measure for what hands down has to be the worst greenscreens I ever seen in 
> my life, and boy I seen bad stuff before but this one takes the cake.  Thanks 
> for all the input, I end up using Frank's suggestion it works like a charm.
> Back to more greenscreen hell on St Patrick's day, what an irony !
> 
> 
> Happy Green Beer day for you all  !!!.
> 
> 
> 
> Manuel Gonzalez
> 
> 
> ***
> "Support Bacteria;
> The only culture some people have."
> ___
> Nuke-users mailing list
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> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
> 
> 
> 
> -- 
> __
> Fredrik Pihl
> digital compositor
> +46-708-559 559
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Re: [Nuke-users] Greenscreens from Hell.

[Randy Little]

one of the worst but not the worst green screen I ever saw was well lit with
no seems or shadows.   the subjects. about 20 or so dancing things were
mainly blue and every 18 inches was a blue X on about a 600+ frames with all
the cuts.
Randy S. Little
http://www.rslittle.com 




On Fri, Mar 18, 2011 at 11:41, Vincent Poitras  wrote:

> haha funny I had my worst greenscreen ever not so long agonothing was
> keyable on itand i mean nothing!
>
>
>
> On 2011-03-18, at 11:59 AM, fredd hidef wrote:
>
> We should have a "Worst Green/Blue screens of our life" competition with
> collection of screen dumps... Could be nice to show whining juniors :)
>
> "Oh yeah, You think U have it bad? Well, boy, look at this!" haha
>
> I surely have a few candidates...
>
> //fredd
>
> On Thu, Mar 17, 2011 at 3:47 PM, Manuel Gonzalez <
> nosweats...@earthlink.net> wrote:
>
>> Thanks for all the answers.
>>
>>
>> I usually don't like to premult before keying but this was a desperate
>> measure for what hands down has to be the worst greenscreens I ever seen in
>> my life, and boy I seen bad stuff before but this one takes the cake.
>>  Thanks for all the input, I end up using Frank's suggestion it works like a
>> charm.
>> Back to more greenscreen hell on St Patrick's day, what an irony !
>>
>>
>> Happy Green Beer day for you all  !!!.
>>
>>
>>
>> Manuel Gonzalez
>>
>>
>>
>> ***
>> "Support Bacteria;
>> The only culture some people have."
>> ___
>> Nuke-users mailing list
>> Nuke-users@support.thefoundry.co.uk
>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
>>
>
>
>
> --
> __
> Fredrik Pihl
> digital compositor
> +46-708-559 559
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Re: [Nuke-users] Greenscreens from Hell.

[Ron Ganbar]

You all probably seen this, but:
http://www.youtube.com/watch?v=DlqAsLxxtYM


Ron Ganbar
email: ron...@gmail.com
tel: +44 (0)7968 007 309 [UK]
 +972 (0)54 255 9765 [Israel]
url: http://ronganbar.wordpress.com/


On 18 March 2011 23:05, Ivan Busquets  wrote:

>
>
> On Fri, Mar 18, 2011 at 10:41 AM, Vincent Poitras wrote:
>
>> haha funny I had my worst greenscreen ever not so long agonothing was
>> keyable on itand i mean nothing!
>>
>>
>>
>> On 2011-03-18, at 11:59 AM, fredd hidef wrote:
>>
>> We should have a "Worst Green/Blue screens of our life" competition with
>> collection of screen dumps... Could be nice to show whining juniors :)
>>
>> "Oh yeah, You think U have it bad? Well, boy, look at this!" haha
>>
>> I surely have a few candidates...
>>
>> //fredd
>>
>> On Thu, Mar 17, 2011 at 3:47 PM, Manuel Gonzalez <
>> nosweats...@earthlink.net> wrote:
>>
>>> Thanks for all the answers.
>>>
>>>
>>> I usually don't like to premult before keying but this was a desperate
>>> measure for what hands down has to be the worst greenscreens I ever seen in
>>> my life, and boy I seen bad stuff before but this one takes the cake.
>>>  Thanks for all the input, I end up using Frank's suggestion it works like a
>>> charm.
>>> Back to more greenscreen hell on St Patrick's day, what an irony !
>>>
>>>
>>> Happy Green Beer day for you all  !!!.
>>>
>>>
>>>
>>> Manuel Gonzalez
>>>
>>>
>>>
>>> ***
>>> "Support Bacteria;
>>> The only culture some people have."
>>> ___
>>> Nuke-users mailing list
>>> Nuke-users@support.thefoundry.co.uk
>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
>>>
>>
>>
>>
>> --
>> __
>> Fredrik Pihl
>> digital compositor
>> +46-708-559 559
>>  ___
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Re: [Nuke-users] Greenscreens from Hell.

[david yu]

hahaha i'll be singing this song all day. Cant get it out of my head.

dave

On 3/19/11 5:08 AM, Ron Ganbar wrote:

You all probably seen this, but:
http://www.youtube.com/watch?v=DlqAsLxxtYM


Ron Ganbar
email: ron...@gmail.com 
tel: +44 (0)7968 007 309 [UK]
 +972 (0)54 255 9765 [Israel]
url: http://ronganbar.wordpress.com/


On 18 March 2011 23:05, Ivan Busquets > wrote:




On Fri, Mar 18, 2011 at 10:41 AM, Vincent Poitras
mailto:vinc...@rodeofx.com>> wrote:

haha funny I had my worst greenscreen ever not so long
agonothing was keyable on itand i mean nothing!



On 2011-03-18, at 11:59 AM, fredd hidef wrote:


We should have a "Worst Green/Blue screens of our life"
competition with collection of screen dumps... Could be nice
to show whining juniors :)

"Oh yeah, You think U have it bad? Well, boy, look at this!" haha

I surely have a few candidates...

//fredd

On Thu, Mar 17, 2011 at 3:47 PM, Manuel Gonzalez
mailto:nosweats...@earthlink.net>> wrote:

Thanks for all the answers.


I usually don't like to premult before keying but this
was a desperate measure for what hands down has to be the
worst greenscreens I ever seen in my life, and boy I seen
bad stuff before but this one takes the cake.  Thanks for
all the input, I end up using Frank's suggestion it works
like a charm.
Back to more greenscreen hell on St Patrick's day, what
an irony !


Happy Green Beer day for you all  !!!.



Manuel Gonzalez



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