Green Screen Tech Demo - 7/11/2014

Unfortunately, I was not able to post this when I done it because I was busy doing tests and such.

Green Screen Tech Demo - Notes

• Use flood lights in order to get even lighting across the green screen. This is to avoid hot/cold spots on the screen.
• Use a flat surface to avoid shadows. This will create different light exposures on the screen. Iron the screen where necessary.
• The material used is important! Be cautious of reflective materials. This is because the color will slightly shine on the subject, thus creating a problem in post. 
• Use scrim on red head lights in order to try and take away hot spots. This is due to the intensity of the lights.
• When using red heads on the screen, aim them away from the green screen and use a reflector to shine the light. This is to avoid high intensity hot spots and will allow the light to be even.
• The subject should be lit with the same lights as the green screen. To light the subject, have it in front of the green screen lighting and light separately.
• When lighting a subject, include overhead lighting in order to get rid of shadows. (if lighting a whole person).
• When you are green screening one subject, a minimum of 2 flood lights and 3 red head lights will be needed to light the green screen and subject.
• When green screening a window, where possible remove the glass in order to get rid of reflections and light glares. Also, place the green screen behind the window frame.
• If glass cant be removed on a big window, place the green screen outside on the other side of the window and avoid lighting towards the glass.

When using a P2 Camera:

• Its important to shoot progressive. This is because motion/blur need to be refined.
• Shoot in 720P.
• Use a high shutter speed in order to define the image. The standard for shutter speed is usually double the frame rate.
• Higher shutter = more light needed.
• When filming with a high shutter speed, the image will look artificial. In post production, add a blur in order to make it look realistic.
• Use the zebra setting in order to see exposure.
• In order to logistically keep track of exposure (Graph), use the waveform setting. This will show a graph using waveforms to record exposure. You will want the line on the graph as flat as possible.
• Aim for around 70-80% exposure.
• Avoid a shallow depth of field. 

When using an AVC:

• Need to shoot in 1080/25P
• For both AVC and P2, avoid interlace where possible.