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Need to lightly blur background in interview clip

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Gilbert Daspit
Need to lightly blur background in interview clip
on Apr 6, 2010 at 5:07:13 pm

Hi --
I'm using FCP 6.0.6 and I have some interview footage I'd like to effect a little.
I have a seated interviewee and framed diplomas on his wall about 5 feet behind him. His head is covering most of them, but part are sticking out on the left side. It could fly as is, but it's enough to annoy me. I used garbage matte to make a quick matte and apply slight blur to the background of the image and it improves things. But garbage matte isn't precise enough and I imagine the best kind of matte would be a dynamic one. On the FCP forum someone suggested using a track matte in Motion or Shake. I've done very little work in Motion and none in Shake but I have worked with AE. Unfortunately, I'm working with vers. 6.5, but it does have track mattes. Can anyone suggest a method for doing this?
Thanks.


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Dave LaRonde
Re: Need to lightly blur background in interview clip
on Apr 6, 2010 at 5:10:05 pm

Rotoscoping to the rescue! It's time consuming and no fun! I hope it's worth it to you to doll up the shot!

http://forums.creativecow.net/thread/2/976398


Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Gilbert Daspit
Re: Need to lightly blur background in interview clip
on Apr 6, 2010 at 5:21:20 pm

The very word (rotoscoping) conjures up the sensation of sitting in my office chair for days and nights. As you noted, it would really have to be worth a lot to do that, I'll probably look into some other way.

Thanks for the reply, though.


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Chris Wright
Re: Need to lightly blur background in interview clip
on Apr 6, 2010 at 10:02:02 pm

there's a couple of tricks you can do to speed up roto if you don't have mocha...

1. use multiple keys to create mattes

2. Motion tracks garbage mattes
AE ENHANCERS :: View topic - Rototracking palette for AE 6.5 SAVE PEOPLE41 http://usuarios.lycos.es/thehardmenpath/scripts/RotAE.jsx

3. build your own procedural mattes

a) a tut
http://www.videocopilot.net/tutorial/advanced_sky_replacement/
b) your own custom procedural mattes

add channel-shift channel to footage
take alpha from Red
take red from Full Off
take green from Full Off
take blue from Full Off

add channel-Alpha levels


duplicate that layer (set as above the first layer) and set the new layer's shift channel alpha from red to saturation and set layer mode to stencil alpha.

mess with alpha levels-input black and input white levels from both layers to isolate colors by the specific combination of chroma and sat. then alpha matte it as a precomp.

This works extremely well and even fixes hard keying, skin problems, roto, etc.

http://technicolorsoftware.hostzi.com/


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Gilbert Daspit
Re: Need to lightly blur background in interview clip
on Apr 7, 2010 at 12:52:00 pm

Thanks for a lot of ideas. I'll see what I can do with them.


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Tudor Jelescu
Re: Need to lightly blur background in interview clip
on Apr 6, 2010 at 6:33:37 pm

Get CS3 or CS4- Mocha comes free with those.
Then use mocha to track the matte- it's really easy, they got some great tutorials ( Mocha - Imagineer Systems)


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Jason Jenkins
Re: Need to lightly blur background in interview clip
on Apr 6, 2010 at 8:15:29 pm

FYI, Mocha doesn't come with AE CS3.

Jason Jenkins

Flowmotion Media

Video production... with style!


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