Chroma Key Question

F

frito

New member
So I've been messing around with Green screen and chroma key. All good, works well. Now, my issue is I have some footage that wasn't taken in front of a green screen and I need to pluck the image of the person from this 10 second clip and substitute the background footage with something different (more of a static artsy background). How difficult is this? I'm guessing I can snag a wide variety of colors on the chroma key, but I'm also guessing some of those colors will clash with the clothing and/or flesh tones of the subject.

Another example of what I'm trying to do is where you see a basketball player go up for a dunk, the image of the dunker is now taken off the regular background and placed on something art-sports looking with some titling etc. Then maybe the frame freezes as well. I hope that expresses the idea I'm trying to attain.

Any advice is appreciated!
 
I dont know much about keying, but for something like that my initial instint is rotoscoping. Dont know if Vegas has any provisions for this or not, but I know After Effects does. You basically end up creating a key-framed mask. Rotoscoping is VERY time intensive so beware.
 
The chorma keyer in Vegas leaves a little to be desired, but you can get good results with it. My way of working with it is to use the secondary color corrector on your green screen first, making it super saturated and then use the chroma key. For some reason, the secondary color corrector's controls are a lot more flexible then the chroma keyer's.

And Vegas can roto. Click on the pan/crop tool on the clip and click the "mask" check box at the bottom. You can now draw a mask frame by frame.
 
So I'm familiar with the "Mask" checkbox, but can a mask be drawn freehand frame by frame? I just clikc the checkbox and then start to outline?
 
Yup. You don't need to redraw it every frame though. You can draw in on your first frame and then just animate the mask frame by frame.
 
You must log in or register to reply here.
Back
Top