Green screening a spray of tiny clear objects at

Go Back   DV Info Net > The Tools of DV and HD Production > Open DV Discussion

Open DV Discussion
For topics which don't fit into any of the other categories.

Thread Tools Search this Thread
Old July 24th, 2010, 11:41 AM   #1
Regular Crew
Join Date: Oct 2006
Location: Buffalo, New York
Posts: 51
Green screening a spray of tiny clear objects

I'm trying to make it look like clear crystals are shooting out of a persons ear.

I'm thinking that using a green screen and a hose full of plastic crystals that we can get them shooting out in the desired way, however, I'm not sure if its possible to film them from a distance and not have them completely key out when its time to remove the background.

I'm then thinking of simply using the footage, keyed out, over footage of the subject.

I know its an odd request, but does anyone have any ideas I can try? Is green screen a bad idea for something like this?

Panasonic AG-HVX 200
Green screen,
3 Tota Omni's, and a pro
and around $100 spending money.
Steven Hoffman is offline   Reply With Quote
Old July 24th, 2010, 11:49 AM   #2
Inner Circle
Join Date: Sep 2002
Location: Vancouver, British Columbia (formerly Winnipeg, Manitoba) Canada
Posts: 4,086
IF this is possible, I'm going to suggest that a STRONG backlight might be the "key". (Pardon the pun...)

Probably easier to try and find pre-keyed material or CG it yourself...
Shaun C. Roemich Road Dog Media - Vancouver, BC - Videographer - Webcaster Blog:
Shaun Roemich is offline   Reply With Quote
Old July 24th, 2010, 01:20 PM   #3
Regular Crew
Join Date: Jul 2009
Location: Montclair New Jersey
Posts: 101
go to digital juice dot com and check their compositers tool kit. might already have it done for you?

Dano Motley is offline   Reply With Quote
Old July 24th, 2010, 02:09 PM   #4
Inner Circle
Join Date: Oct 2001
Location: Honolulu, HI
Posts: 2,053
Primatte can do this. I've keyed transparent plastic packaging -- the kind that requires a chain saw to open after you bought something like a CF card or similar.

There are several things that need to be carefully set up. One is the green screen -- expose it at 50 IRE. Another is the camera -- do not use any odd matrix setups. You'll want that green to be green. Try to eliminate any sharpening that will create edge artifacts. And shoot only in progressive mode, not interlaced. Of course it should be in 1080 p30 HD.

The HVX can shoot a nice key. I've done it before.

As Shaun suggested, you can use a backlight. While Primatte can key without the backlight, using a point source as a backlight will get the crystals to sparkle. Be aware that any lighting you use on the crystals will also have to make sense in your master shot or it'll look out of place.

OR you can use particle effects if you have After Effects. The advantage is that you can animate it to do almost anything you want, and you can play around with it until you acheive the effect you're looking for.
Dean Sensui
Exec Producer, Hawaii Goes Fishing
Dean Sensui is offline   Reply With Quote
Old July 25th, 2010, 01:56 AM   #5
Join Date: Jan 2004
Location: Scottsdale, AZ 85260
Posts: 1,538
Another vote for After Effects or Apple's Motion.

Both do particle effects so easily that you should be able to get something with an alpha channel that you can composite over an existing shot in short order.
Classroom editing instructor? Check out
Turnkey editor training content including licensed training footage for classroom use.
Bill Davis is offline   Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

Omega Broadcast
(512) 251-7778
Austin, TX

(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

(800) 238-8480
Glendale, CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > Open DV Discussion

Thread Tools Search this Thread
Search this Thread:

Advanced Search



All times are GMT -6. The time now is 08:40 AM.

DV Info Net -- Real Names, Real People, Real Info!
1998-2015 The Digital Video Information Network