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RotoScoping Versus Masking
I have scene that I am working on. It’s the interior of an airplane and I need to replace what is currently being seen outside the airplane window. In the scene passengers arms are in constant motion across the window. I am pretty sure I can use a mask and change the shape frame by frame, but I was thinking about rotoscoping since those tools seem to be able to create an outline pretty quick with just minor fixes between frames. However rotoscoping seems be for cutting out the outline area I need it to exclude that area. I am pretty new to AE and rotoscoping in general, so I am not sure this is correct way to use this tool. Is this a good approach? Any suggestions would be a help. Thanks.
Lou
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3 Replies
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I find I get a little frustrated using masks to rotoscope and generally prefer the rotobrush to do this type of work. The rotobrush isn’t that intuitive though and I’d suggest you take a look at some of the tutorials and information about it before you start. I think this one is really good:
Take a look and if you have more questions get back to us.
Johnny Cuevas, Editor
Thinkck.com“I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.”
—THOMAS EDISON on inventing the light bulb. -
Unfortunately can’t reshoot and they did not use green screen. The shoot was done at night with a real airplane. So to get the cabin well lit they placed white material over the outside of the fuselage covering the windows along with a white back drop by the cabin door and backlit everything with massive flood lights. It diffused the light but the color is not pure white, so I can’t key on it. I am thinking about using mocha pro, or may have to resign self to painful frame by frame masking.
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If it’s at least close to pure white, you might be able to treat it like a sky replacement and do it with track mattes. Duplicate the layer, convert to black-and-white, adjust contrast to blow out the window, mask out the rest of the shot (masking the window will be infinitely easier than masking the moving arm!), then use this layer as a track matte for the original clip.
That’s off the top of my head; this may or may not actually be a good technique in this situation. I just got The After Effects Illusionist and was reading about channel effects, color correction, and track mattes the other day, so it’s on my mind. 🙂
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