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Photo bleeding

Posted: Mon, 17th Nov 2008, 9:09pm

Post 1 of 12

Lamplighters

Force: 1400 | Joined: 17th Nov 2008 | Posts: 10

VisionLab User PhotoKey 3 User

Gold Member

I am using the demo of Composite Lab Pro. I have a video with a
photo in the background. The photo in the background is bleeding.
Is that because I am using the Demo version? I have to know
these things before I buy it.
Posted: Mon, 17th Nov 2008, 10:57pm

Post 2 of 12

Axeman

Force: 17995 | Joined: 20th Jan 2002 | Posts: 6124

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SuperUser

Can you show us an image of what you are talking about?

You can upload a picture to www.imageshack.us if you don't have webspace, then provide a link to it for use to look at. Whatever is going on, I'm pretty sure it isn't because its the demo, and you should be able to clear it up by adjusting some settings. Once we can see it, we can provide more specific suggestions as to what settings to alter.
Posted: Tue, 18th Nov 2008, 12:31pm

Post 3 of 12

Lamplighters

Force: 1400 | Joined: 17th Nov 2008 | Posts: 10

VisionLab User PhotoKey 3 User

Gold Member

Here is the link so you can view my video. I just gave a small sample of it. I know it is adjustments, but I am so new to this. I have not figured it out yet. Thank you

http://img531.imageshack.us/content.php?page=done&l=img531/3640/uploadtestforgreenscreeqz6.flv
Posted: Tue, 18th Nov 2008, 1:20pm

Post 4 of 12

Xcession

Force: 42802 | Joined: 21st Mar 2001 | Posts: 1964

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SuperUser

It looks to me like you've misunderstood a fundamental concept of colour keying. Software which keys out backgrounds isn't psychic - all it does is look for a single specific colour in the image, and remove it, regardless where it is. Thats how all keying software works. The colour of the background wall/screen that you use must depend on the clothing your actors are wearing. The colours in their clothing cannot be the same as the background wall, because obviously the software will remove that colour whether its the background wall, or their clothes, or the colour of their eyes, or the props, or whatever.

It looks to me like you're using a black-screen. Black is a bad idea because all footage contains dark areas. (White is equally bad, since all footage contains bright areas). Your actors appear to be wearing black, which is even worse! The software cannot know the difference between the black of a wall and the black of a sweater, so the result is that its removing the black colours in the clothing of your actors.

I think your only solution is to re-film the footage in front of a green or blue screen.
Posted: Tue, 18th Nov 2008, 1:32pm

Post 5 of 12

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

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FXhome Team Member

Can you upload the original shot before it is composited as well? It's easier to provide advice if we can see the original rather than the composite.
Posted: Tue, 18th Nov 2008, 8:23pm

Post 6 of 12

Lamplighters

Force: 1400 | Joined: 17th Nov 2008 | Posts: 10

VisionLab User PhotoKey 3 User

Gold Member

In my composite, I was using a green screen not black. I will upload the original without any keying done.
Posted: Tue, 18th Nov 2008, 8:30pm

Post 7 of 12

Lamplighters

Force: 1400 | Joined: 17th Nov 2008 | Posts: 10

VisionLab User PhotoKey 3 User

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http://img531.imageshack.us/content.php?page=done&l=img531/9513/introductionwithgreenscoy2.flv

Here is a link to see my original project with green screen.
Posted: Tue, 18th Nov 2008, 11:58pm

Post 8 of 12

Axeman

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SuperUser

Right, in that clip you will notive a lot of green light being cast onto the talent, especially in her hair. This can be prevented by moving them farther away from the greenscreen. Five feet or more is best.
However, at first glance it looks like that footage should be capable of a better key than the one you first posted. What key filter did you use? Can you tell us the settings that you used on it?
Posted: Wed, 19th Nov 2008, 11:16am

Post 9 of 12

Lamplighters

Force: 1400 | Joined: 17th Nov 2008 | Posts: 10

VisionLab User PhotoKey 3 User

Gold Member

I am using the composite lab key. Black point and white point are at zero. I put them at another value but it changes back.
Invert selection is off.The next box down says remove.
Inner Hue and Feather Hue are at 45.00 Saturation Inner and Saturation FEather is at 15.00 Value inner and Value feather is at 15.00
Invert selection is off.
I hope this is what you mean by settings. I am just starting to learn this program so please bare with me.
Posted: Wed, 19th Nov 2008, 11:47am

Post 10 of 12

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

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FXhome Team Member

Ah, sounds like you're using the chroma key. Do you know the exact name of the key filter you're using?

Regardless, the one you want to use is the 'auto colour difference key'. I think you'll get better results with that.

Also, it sounds like you're adjusting your key settings over time without realising it, which would explain why the composite example video you put up changes so much throughout.

Whenever you change a setting it adds a keyframe to the timeline, so if you're moving around the video you're going to end up putting lots of keyframes down. Keep an eye on the little blue squares on the timeline for this.
Posted: Thu, 20th Nov 2008, 11:31am

Post 11 of 12

Lamplighters

Force: 1400 | Joined: 17th Nov 2008 | Posts: 10

VisionLab User PhotoKey 3 User

Gold Member

Thank you. Using the auto colour difference key made the difference. The only problem left is a green hue around our bodies. I think that can be solved by getting farther away from the green screen. I will let you know how it works.
Posted: Thu, 20th Nov 2008, 11:38am

Post 12 of 12

Simon K Jones

Force: 27955 | Joined: 1st Jan 2002 | Posts: 11683

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FXhome Team Member

Also try going to the 'Grade' toolset and adding a spill suppression filter.