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composting in AE…blue screen and green screen…
I have long wanted to understand the idea behind ‘green screen’ and ‘blue screen’. I have searched the internet for valuable info regarding this topic but yet not found anything tangible.
Can someone please explain the progcess of blue screen and green screen…and also can this be achieved in AE which is a digital composite software.I also what to know…whats the difference between matte painting and compositing…could matte painting be the oppsoite of compositing…
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7 Replies
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Go to your effects, and look for the section titled Keying. Also there is an effect below that called simple choker which you could find useful. Also learn how to use Track Matte.
Matte painting is a specific type of compositing. I think it means when the upper layer is fabricated rather than recorded.
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Dear Robert,
U did well trying to reply my post…but what you didnt do was try to answer my question explicitly. Even if I do as you have told me to…I still won’t understand…
I need to undertand the term blue screen and green screen and how they can be be used in compositing.
Thank you very much…
‘kk’ -
Green screening or blue screening is the act of shooting something in front of a solid coloured background and then replacing that background afterwards.
After Effects ships with several effects that can be used for keying. (Keying is a more general term that encompases both green and blue screening plus other ways of replacing the background.) These are effects that are listed under Keying as I said. They make certain parts of the layer transparent, letting the lower layers show through. Right below Keying on the effects menu is Matte, which has Simple Choker. This gives you another way to tweak how much of the image is transparent.
You should probably use Chroma Key first. It is the easiest to understand, though not the most powerful.
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Dear Robert,
Thank you very much for the info…now this is more like it…your reply was what I needed to understand the term. Tho’ at the moment I am doing a search on the google for pix or even demo-reels that explains it in visuals…
In your reply you said AE ships with several effects that can be used for keying…are you saying this effects ships on a seperate CD rather than the instalation CD…
You also said that Chroma Key should be what I should use first becos it’s easier to understand and not the most powerful…okay’ll i’ll try this but I want to ask you which of the keying efx do you think is more effective or rather powerful.
One last thing…why must the colour green or blue be used…that is I have to be shooting a scene on either a green or blue brackground…
thanks alot for your reply…
Regards,
‘kk’ -
green and blue are used because after effects automatically makes those colored pixels transparent, and those are colors that are least likely to show up in places where you DO want the pixels to be OPAQUE(like the face, for example). Two of the best keying plugins out there are Keylight and Primatte Keyer.
Alexander Gao
“When the revolution happens, I’ll be leading it.”
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The effects I listed come installed with AE.
Keylight and Primatte I think have to be purchased seperately.
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I just checked out the Keylight programme at http://www.pluginz.com and the programme of that programme is bloody expensive…it’s over $4,000 dollar…pheww!!!…is it worth the price…but from what I see on their website…I think it’s cool…or what do you guyz think…
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