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Difficult Green Screen Shot + Spill
Hello,
I’ve been working with After Effects for some time and I’ve done keying, but I have a project where I’d like to use this footage from Action VFX.
I think I managed to get a decent key on the upper part, but
I just can’t seem to get it right when trying to separate the feet and
the shadow. What would the approach be for that part? As you can see
from this screen recording I made a copy of the first color corrected clip and pre comped it. I
tried to bring more brightness and contrast so I can separate the shadow
more clearly. Then I masked the feet and the shadow and tried to use
keylight and advanced spill suppressor, but I can’t make the shadow a
bit more realistic, it still has noise in it, especially if I apply a
multiply blend mode, plus the transparency and color isn’t exactly
right.The other problem is there’s still some gray garbage left from
the key and mask of the main key. I can’t use the matte of the legs and
shadow as a track matte with the original clip, because the comp of the
feet and shadow has transparent parts where the space suit pants are. If
I try to bring more of the matte on the pants, the shadow gets some of
the spill back. I also tried to make the legs + shadow matte black and
white with tint and curves and use it as a luma matte, but again, it
wasn’t good because of the pants down there. I’m attaching a screenshot of the lower part so you see what I meanWhat would I have to make different? Is it possible only with settings to get a good key of everything, or do I have to do frame by frame rotoscoping of the feet to remove the gray garbage?
I’d be very thankful to the more experienced members here for some advice.
Thanks.
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5 Replies
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Recently, whenever I’ve struggled with keying, I’ve found that rotobrush solves the problem for me. Combined with Key Cleaner and Advanced Spill Suppressor, it’s given me a better key. No good for hair of course, but that’s not something you’re worrying about with your shot.
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Just my 2 cents, but if this was essential for anything I needed to use for a paid client, I would just find and pay(and bill it to them) for a properly lit shot. The amount of work needed to make that shot look good will never cost as much as just buying better footage.
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I did try including rotobrush, but it doesn’t do a good job here. There are tiny spaces between his legs that open and close, plus that brightness in the suit screws up with the rotobrush tracking I guess, so the tracking is ok in one moment, and the next it mixes up a lot, I can’t control it. If it isn’t doable with a technique using the settings of the software, I guess the only way to make it in After Effects is doing some frame by frame masking, which is very tedious
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It’s not for a paid client. I had an idea for a personal project, to track the camera, isolate the astronaut and move him into Blender to put him in a spaceship corridor, walking towards a shuttle. But I didn’t have the time lately to finish that keying succesfully. I want to be able to handle more complex shots and cases, so I decided to take on this one, but I guess it’s not worth the time to do it frame by frame with masking.
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Yeah, that’ll take some work to get it right. Not an easy key with all that spill. I think you’re going to have to spend a few hours and just brute force roto those feet. I’d suggest doing it in mocha if you know how. And maybe do a luma key for the shadow if Keylight isnt working.
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