Spray Painting an image on a background

Question

Spray Painting an image on a background

For a theatre play I need to create an effect as if I am spray painting an image (a graffiti...) on a plain screen
The actor/s will spray paint on a screen and we want to have the effect as if he is actually doing it
We might then put a wall as a background for the graffiti
The image will be back projected so that can look kind of real....(I know it won't...)

Powerbokk G4 1.25Ghz Mac OS X (10.4.4)

Posted on Jan 29, 2006 5:44 AM

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Answer 1

Jan 29, 2006 7:21 AM in response to criminalshooting

The topic you will need to study is GRADIENT WIPE.
You bring in a grayscale image and use that to reveal your video. It's just a matte operation with luma control. More sophisticated applications of gradient wipe use a video image to control the matte. It's not difficult. Can also be done with green or blue. The trick is choreographing your actor with the prerecorded reveal.

bogiesan

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Answer 2

Jan 29, 2006 1:43 PM in response to criminalshooting

It would probably help to have the camera on sticks, you could then use a difference map to pull the character off of the background, then have the spray-painted image appear in between the character and the background...

N

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