Blue/Green Screen

Blue Screen set up. Balancing the subject key light with the exposure on the blue screen employing the studio white card balance technique.

Blue Screen with actors

Actresses with thin blond hair, blowing in the breeze, represents a challenge for any traveling matte capture.

Blue Screen with liquids

Liquids are difficult to hold in a matte composite. Blue/Green screen traveling mattes are more sensitive and create excellent mattes when capture is exact.

Blue Screen with flame

Flame is often added in post as it is also difficult to capture without a matted look in the final composite.

Blue Screen in 3D

Duel camera capture. Convergence corrections in post. Two images combinrf in FCP, Avid, or After Effects for video HD projection.

Moe info on 3D at this site
http://www.lhup.edu/~dsimanek/3d/stereo/3dgallery.htm

Practice Quiz

Practice Quiz – Red/Green/Blue Screen

1. The white card balance is the technique best suited to make quick accurate blue screen set-ups.

2. The actor should be as far away from the blue screen as possible, a minimum of 15 feet is recommended.

3. Step one, in setting up the blue screen balance is to turn off the screen lighting and have the DP light the subject.

4. Step two; in setting up the blue screen balance is to place a white card in the actor’s key light.

5. Using a number 47B filter, balance the screen brightness to the white card brightness.

6. Using a number 29 red filter check the screen visually for white light spill from the screen lamps.

7. The blue/green/red traveling matte system is the system that creates the most accurate mattes for Compositing.

8. After balancing the blue screen to the white card and checking for spill on the screen with the red filter you are now ready to take a light reading. Place the light meter in the path of the key light at the white card position and take one reading at this spot.

9. Care should be taken to assure that the screen is evenly lit.

10. Always shoot a gray scale card at the head of the shot in order to balance the material in the comp stage of post production.