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barry_6555
Participant
October 18, 2024
Question

Difficult Green Screen Key With A Lot Of Spill

  • October 18, 2024
  • 1 reply
  • 579 views

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.

 

I've been trying for almost 2 days with a bit different approaches, but nothing works quite as it should, you can see that the spacer suit just has too much spill and is very shiny, plus the green screen room has different nuances of the green some pleats. I tried to enhance the color with Lumetri, but I guess it doesn't help much.

 

What I currently have tried is doing multiple masks on the original layer and assigning multiple keylight effects for each of them. I have another comp for preserving the shadow. I also tried using Ae Scripts Composite Brush, but it just adds a little to the whole key, I guess it's not suitable for keying a subject that contains the exact same color as the background. I can still do a little work with keyframing the masks, but overall it won't change the result - you can see some chatter, flicker, contours, unsmooth edges, especially in the feet area, where there are also shadows.

 

Rotobrush is not good enough to cut the subject while moving. I was thinking about separating a good roto and perhaps change the green color on it in the most shiny and reflective spots, but I can't do it.

 

Would some of you with more experience give me a tip on the exact workflow I need to follow in order to make this happen decently? I'd be happy to learn how to complete such a difficult green screen shot for future projects.

 

You can watch a screen recording video of my settings here.

 

I'd be grateful for any instructions.

This topic has been closed for replies.

1 reply

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Community Expert
Rick GerardCommunity Expert
Community Expert
October 19, 2024

The first step is to run Lumetri or some other tools to color-correct the footage, removing as much of the green spill as possible and increasing the green saturation on the background. 

This is what I did with a screen capture of the footage.

 

Then, Pre-compose and run Keylight. Here are the modified properties and the Combined Matte from Keylight:

Then, duplicate everything and work on just the shadows on the floor. When you get both combined mattes, one of the body, one of the feet, and the floor combine them to create a track matte for the original footage. You might also need to do some masking.

 

 

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barry_6555Author
Participant
October 19, 2024

Hi Rick,

 

Thank you for commenting on the thread. I think I managed to get a decent key on the upper part as you said, 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 the new screen rec 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. Here's what I mean:

What would I have to do different?

 

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