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Help. How the key/grade out the green glow.

Posted: Sun, 15th Feb 2009, 11:51am

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cazg

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Green Screening.

I've been searching and cannot find anything definative about how the get rid of the green glow, just "Make a few adjustments". the one text tutorial does not follow the available steps in Vision Lab.http://fxhome.com/support/tutorials/view/13/Greenscreen+keying
And the Visual tutorials do not show ANY detail into this procedure. It just happens.


Any settings or steps beyond Choose Color Difference/ChromaKey would be appreciated.

Below is a link to what I've done in Pinnacle 12. I bought VL cause I want a result like http://geekbrief.tv

http://www.youtube.com/watch?v=9Clbyk4oEwk

Last edited Mon, 16th Feb 2009, 8:02am; edited 1 times in total.

Posted: Sun, 15th Feb 2009, 4:48pm

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Axeman

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Without seeing your footage (before any keying), its impossible to offer specific advice on how to improve it. Please provide a link to a brief clip or an image, so we can see what you are working with. Frequently the best way to improve greenscreen footage is to adjust the lighting/greenscreen setup, so by seeing your footage, we can likely offer some advice in that area as well, in addition to suggestions on how to improve your key. If it seems to just 'happen' with other footage, it could be because when your greenscreen is properly set up, haloing around the edges isn't a major problem.

Here are a few general suggestions, which may or may not be relevant to your situation. You might already be doing all these things. Can't tell without seeing your footage.

1. Make sure there is at least 6 feet between your actor/foreground and the greenscreen while filming.
2. Use the Color Difference key. Keep the black point low and bring the white point down toward it.
3. Use a Spill Suppression filter after you apply the key.
4. Use grading filters to tweak the color/contrast of your foreground so it blends with the background you have chosen.
Posted: Sun, 15th Feb 2009, 10:22pm

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cazg

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Please take a look at this video from FXHome.com. There only seems to be one example of the subject at least six feet away or of properly lighted backgrounds. But things work great. I'd like to know how to do this.
http://www.youtube.com/watch?v=CsOqA7BdcZw&NR=1

I've found this reference in the docs but cannot locate the Spill Suppression filter: "Note: If you are using a greenscreen or bluescreen, you may also want to use the spill suppression tool, in the Grade section."


I will upload my raw footage later today, however if someone can point me to the Spill Suppression filter I would appreciate it.

Caz
Posted: Sun, 15th Feb 2009, 11:17pm

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cazg

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I should note that I understand the Key Grade solutions. I'm really concerned with the glow problems.

Caz
Posted: Sun, 15th Feb 2009, 11:33pm

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spydurhank

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The spill surpression filter is in the "grade effects" section to the top right of the screen.
Everything is alphabatized so just scroll down to the S's.
Posted: Sun, 15th Feb 2009, 11:44pm

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cazg

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My "s"'s include and are limited to: Saturation and Sharpen when I select Grade.

Caz
Posted: Mon, 16th Feb 2009, 12:37am

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spydurhank

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cazg wrote:

My "s"'s include and are limited to: Saturation and Sharpen when I select Grade.

Caz
Oh, thare's something wrong there.
you should have; saturation, sepia, sharpen, sharpen brightness, solorize and spill suppression.
Posted: Mon, 16th Feb 2009, 5:19am

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cazg

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I ventured into my office right now (9PM Sunday night) and on my production computer, the trial version is installed at home, and I found the Spill Suppression. Things look immediately better.

*******
Just a wish (for another forum probably) I'd like to run full versions on 2 computers, One laptop and One Production machine. After over $500.00 USD I'd still pay another $100.00 for another license.
*******


Still I really would like to see a tutorial on how to fix bad keys, rather than showing and teasing us with the fact that it can be done. I believe you, I just want to know how smile

Caz
Posted: Mon, 16th Feb 2009, 5:51am

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Axeman

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We'll be happy to give you specific suggestions, we just need something to work with. As I said to start with, we need to see an image or clip of your footage, as the process for fixing a bad key will vary with every situation. As soon as you can get us something for reference, I'm sure we can give specific suggestions for how to improve it.
Posted: Mon, 16th Feb 2009, 6:39am

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cazg

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OK, Here is the FTP info for :30 seconds of the file. Pinnacle has exported 2 files. One in MOV and another in AVI. Both are there.

ftp: photocasket.com
user: fxhome
pass: fxhom3
port 21

This will only remain open for 2 days. Writing has been disabled.

Thanks for taking a look.

Caz
Posted: Mon, 16th Feb 2009, 4:20pm

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Axeman

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I tried with 2 different apps and was unable to connect to that ftp host. Is it possible for you to just provide a link?

EDIT: I've just talked with Tarn and he was able to download the files, so he should be able to chime in with some suggestions soon.
Posted: Mon, 16th Feb 2009, 4:50pm

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Simon K Jones

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Managed to download the files here, thanks for uploading them.

One thing I noticed is that the lighting changes quite drastically during the course of the clip, from warm oranges to cool blues. This might be due to light from nearby windows changing as the sun went behind clouds, or due to the studio lights being changed, or due to the camera constantly re-evaluating the white balance. You might want to look into the possible cause(s).

There does seem to be a lot of colour spill in the original. If you look at the edges of the girl's top, you can see a lot of green spill just with the naked eye. From the looks of things she was seated very close to the greenscreen, so the best recommendation would be to move her further away. This is particularly important if you're filming on a low resolution NTSC camera, where colours can blur together.

Other than getting some more distance, though, your greenscreen looks excellent. So my main recommendations would be to put more distance between your subject and your greenscreen and find out what's causing the lighting fluctuations.

Here's an example composite I threw together:

http://tarn.fxhome.com/cazgexample1.png

I used a sharpen key grade filter, then an auto color difference key (with user grey raised to 0.33), then spill suppression. Afterwards I threw on a few grading filters to blend the layers together a bit.
Posted: Mon, 16th Feb 2009, 6:12pm

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cazg

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Axeman: Thanks for trying. Passive FTP is turned off on my server. That was probably the issue with your clients. Most FTP clients try Passive by default.

Tarn: Great eyes. Yes the hues do get cooler. The vid was shot between 5:00PM and 6:00PM. The lights were stable but there is a wall sized window and the sun was setting. Even with the blinds closed the change in hue is perceptible. I didn't realized it until you pointed this out.

**************
Particulars:
She is sitting 4 feet from the Green Screen. Primarily because my GS was so small. 10 minutes ago FEDEX delivered the full VL package with a very big Green Screen!

My camera is a Canon GL2. I'm guessing that I need to turn off the gain so the camera is NOT constantly making adjustments. I cant afford to fix the window sad
**************

The image that you've linked is what I'm going for. I will try the steps that you detail and try to reproduce the results. Which file did you work with? MOV or AVI? I'll then post the results. AXEMAN: I'll provide a link. FTP is faster (when it works)!

Caz
Posted: Mon, 16th Feb 2009, 7:30pm

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spydurhank

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Dude Tarn,
Awesome keying man.
cazg, Good luck with your work.
Glad you bought V.L. It can work wonders, with your help of course. biggrin
Posted: Tue, 17th Feb 2009, 6:39am

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cazg

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Ok guys. Tried Tarns steps exactly and I got the exact results. Great. I dont understand the User Grey setting or what it does, but it worked just as advertised.

Here is a link to a frame grab: http://www.photocasket.com/cazg-alethea.mov

Caz
Posted: Tue, 17th Feb 2009, 9:24am

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Simon K Jones

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Ah, glad you're getting the results you need now, cazg. Once you make a few tweaks to your setup you'll probably get even better composites.

If you've got a GL2 you might want to consider using the 'frame' mode. This records a sort-of progressive image which is higher res than using the interlaced mode and might yield better composites. If you're filming stuff primarily for the web then this would make sense as you wouldn't need to deinterlace.