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Post Production, Editing + Compositing
AE Compositing Help
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bzudo 151 posts06 Feb 2008I am working on this project at work. The video they shot of the guest talking has a background that is completely blown out. They did however shoot a background shot with the proper levels. I've been playing around with the luma key and keylight for a while now. I was wondering if anybody here would have a good approach to keying out the blown out background. Any ideas?
Below are the two images. -
06 Feb 2008yeah, luma or take a look at the channels.
And don't use the Luma Key effect. There's a much easier, better way to do it that gives you way more control. Duplicate your footage, and apply a Hue/Saturation and a Levels to the duplicate. In the Hue/Sat, turn the saturation all the way down, so the image goes black and white.
Now use the levels to dial in the whites and blacks. You can adjust the grey point as well. To me, this is a much, much more interactive and intuitive way to do a luma key than the crappy luma key effect. You can even do it real-time: put your background image as the bottom layer, then your woman layer on top of that, then the duplicate hue/sat levels layer above that, and set the woman layer to a "luma" track matte. Now, you can open the levels effect on that layer and adjust, seeing the comped result in real time. Super easy and fast.
You can also use one of the channels. Cycle through the red green and blue and see if any of them have tons of hair info. The blue will be the worst, by far. I did a tutorial on how to use individual channels to get a great matte to use with hair.
viewtopic.php?t=3809
Anyway, hope that helps.
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bzudo 151 posts29 Feb 2008Well this is the best I could do with the 2 shots. I tried using your luma key techinique Hype to no avail. The buildings on the left would turn just as black as the lady with the hue/sat & levels controls applied. I couldn't get a clean key. I really did not want to roto her hair either. I ended up applying a loose mask around the lady speaking and feather the hell out of it. Here is what I came up with. If you have any suggestions let me know. I know it's blown out to hell in the background. If you have any other ideas I'm all ears.
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29 Feb 2008do you mind if i take a stab at it later tonight? I'll just grab those two pics in your first post and do some quick tests. There's definitely a way to get some sky back there. Maybe I'll screenrecord the process, so you can see what i'm trying, what works and what doesn't.
it will be much later tonight, though, cuz I think I have to work at the second studio this evening. Won't get out of there until maybe 11pm or midnight. -
29 Feb 2008Hey bzudo,
So, here's a little 10 minute screen capture of what I was able to do really quickly with the frames. No matter what, it's going to need at least a little bit of roto, but if it's all locked off shots, that shouldn't be too hard at all. This isn't perfect yet, but hopefully you'll understand what and where to tweak settings to keep refining the key.
Hope this helps!
Here's the video:
http://www.mackdadd.com/tutorials/luma_key_01.avi (41 megs)
And the project file (you'll have to find those two frames from your first post)
http://www.mackdadd.com/tutorials/channel_key_01.zip
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bzudo 151 posts01 Mar 2008I'm downloading the video now. I really appreciate the time you took to do this. You're working two jobs and still took the time to setup and record a video tutorial for a stranger. Thanks. I'll post up some of the work once I get done.
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Pierre 61 posts01 Mar 2008 -
bzudo 151 posts02 Mar 2008
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02 Mar 2008
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bzudo 151 posts03 Mar 2008
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bzudo 151 posts05 Mar 2008Here is a quick render of the video after your help Hype. Let me know what you think. I also cleaned up the background. I removed some lighting equipment that was in the shot as well as a wire in the background protruding from the lady's head.
This video will eventually end up on the web. It will be shrunk down in size as well as compressed.
The next step is color correction. If you have any experience with that it would be a big help. Right off the bat, I'd say the shot is too blue and her skin looks orange. I do have SA Color Finesse 2 just haven't had a chance to use it. The video I'm posting has not been color corrected.
http://www.youtube.com/v/zI_94eghsUo -
05 Mar 2008nice work, looks great!! There's a little bit of glow there on the left of her hair, but that's probably fine for web.
As for color correction, I probably wouldn't use Color Finesse for this, unless you really want to use that 3 way corrector. You should be able to do whatever you want with the Levels effect and the Hue/Saturation effect, much faster and easier and with the same quality. Levels will control your contrast and exposure, Hue/Sat can control each color individually. You can also use Levels to shift colors.
In fact, for this one, if it was me, I would drop a Levels on it and turn the blacks up a bit by pulling the Input Black inwards. Input black is the little black carat on the bottom right of the histogram.
Then I would switch the channel to Blue and play around in there to take some of the blue out. This may make it look really yellow, but then try going into some of the other channels and playing around. But use the channel RGB for your contrast, brightness, etc...
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bzudo 151 posts05 Mar 2008cool. what are you thoughts on the rebel cc color correction preset? it has both the levels and hue/saturation effects along with a few other parameters for color correction.
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05 Mar 2008
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05 Mar 2008
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mahmoudnahmad 1,159 posts05 Mar 2008 -
jemi 37 posts09 May 2008
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