One DSLR + One Green Screen = ?

Related Links...

EEFX Green Screens
dvMatte Pro 3 Studio
CG Textures
Light Meter
Learn to Dance

Comments

[mama]

So....ive been asking for a while if SLR can shoot video at all via greenscreen, my two common answers :
one : Actually, a DSLR isn't really a good choice for chroma keying. Sorry.

The reason: the video is recorded at the lousy 4:2:0 color resolution. Think of the TV picture as having a black & white-only layer overlaid by a color information layer.

In the very best color color resolution, 4:4:4, there is one B&W pixel for every piece of B&W information. That's the first four. There is also one color pixel for every piece of color information. That's the second two fours.

However, 4:2:0 is different. There is one B&W pixel for every piece of B&W information as before, represented by the first four. But there is only ONE pixel for every FOUR pieces of color information, represented by the 2:0 part. That means the color pixels have to be bigger to cover the whole screen, which makes the color pixels blockier.

It's good enough to fool the human eye, but that color blockiness is really noticeable to a computer, especially at the edges of a subject. And what's the number one issue when chroma keying? Getting nice, clean edges on the subject.

Can you do anything to fix the edges before you key? Not really. It's recorded that way, and the damage has already been done.

This doesn't mean you CAN'T pull a chroma key with DSLR footage, it means you can't expect to pull a really good-looking chroma key. If that issue isn't too important in your projects, I say knock yourself out and shoot (from Creative Cow forums)

2 is to buy some gear out there made for it, i forgot the name of this company that makes this grey screen with led lights that cap over your lens,

can you verify, sounds like your saying that the 5d is the way to go