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How to make a picture disappear from a portrait

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Akbar Khan
How to make a picture disappear from a portrait
on Sep 26, 2011 at 8:20:52 am

Hello, I'm new to this forum. I'm not sure if this has been asked before. I just can't find what I'm looking for.

I know the question seems confusing, will try to explain it.

I am looking for an effect where a photograph disappears from the background of a video.

Example, A guy is looking at a portrait in a museum and notices the picture slowly disappearing from it and its replaced by a white background.

I need to know how you can make this effect? Its been killing me for days because I'm unable to find the solution for it. I know it should be something simple.

Will be grateful if any of you can help me with this. Thank you

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Michael Szalapski
Re: How to make a picture disappear from a portrait
on Sep 26, 2011 at 2:50:17 pm

Is the camera moving? If not, this will be much easier. Basically, you just need a shot of the wall, and digitally place the picture into the shot. Then animate the picture disappearing. You could animate the opacity for the most simple way to do it. You could use a gradient map transition for some more complexity.

- The Great Szalam
(The 'Great' stands for 'Not So Great, in fact, Extremely Humble')

No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.

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ben g unguren
Re: How to make a picture disappear from a portrait
on Sep 26, 2011 at 3:48:54 pm

If the camera is moving, then you can use a similar approach:

1. Use Photoshop to create a "patch" that will cover the portrait. This will probably go beyond the portrait itself, as there will be shadows from the portrait that it will cover as well, plus you will probably want to feather the edges a bit....

2. Use MochaAE to do a planar track of the portrait itself. This should produce the necessary movement information to match your patch to the wall. If your camera is on a tripod, then a simple position/rotation/scale track will be enough. If the camera is moving (handheld, on a dolly track, etc) then you'll need to export corner-pin information and match things up that way -- a bit trickier, but still doable.

3. Rotoscope out any foreground elements (the guy's head, if it gets in front of the picture, for instance).

When a client comes to me with this kind of shot in mind, it's difficult to say up-front how much work it will take. There are significant variables that, generally, the client hasn't taken into account: is the camera moving? Are there people or other objects obscuring the object? Does the light shift over the course of the shot (shadows from tree leaves outside a window, or something crazy, like a disco ball)? Sometimes the person in the foreground has wild hair, and most of the time is spent trying to make a clean roto of that alone.... (In which case it would have been smarter to put green on the wall, and fake both the picture and the blank wall....)

Ben Unguren
Motion Graphics & Editing

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