Greenscreen troubles

[Super Trooper]

Hey all.

Well, I just did my first chroma key today, and it turned out alot better than I expected. Of course, it still looks like crap.

I just glued six pieces of green construction paper together and lit up a couple of work lights and that was that.

You can clearly see the fishing line holding up the tale and front end.

What do I have to do to get that crap off from around the edges of the plane?
The bottom two look smooth, but only because the pics are so small.

I've seen waaaaay better work done with the dvx and vegas before, so I know I'm doing something wrong here.

The only thing I did was mess with the threshhold a bit, but that was it.

Thanks in advance.

-Troop

 

[Super Trooper]

OK,

I used blur and messed with the levels a bit more and got this:

A definite improvement, but still lacks in terms of overall quality.

I tried using "Chroma Blur", even up to 4 (max) and it didn't look like it had any effect on the image at all. Is this normal? The blur tool on the "Chroma Keyer" option did work though. Is there a difference?

The examples Jimerson posted in this thread http://www.dvxuser.com/V6/showthread.php?t=64830&highlight=greenscreen were simply amazing.

I wish I could get something that smooth around the edges. Do I need some other sort of program to achieve this?

Again, any help would be greatly appreciated.

-Troop

 

[David Jimerson]

Well, remember -- two of those are a little bit of a cheat because they're against black backgrounds.

For the other ones, I did a lot of prep work on them before I applied the keys -- I evened out greenscreen color, applied chroma blurs (multiple), and even applied multiple keys to 1) key out the background and then 2) key out the residual green around the edges.

I don't 100% remember if I did this on the Mustang pass, but another thing you can do is this: prep your clip, apply your key, then check "show mask only." Render it as the black/white mask.

Then, use the rendered AVI as your mask; parent/child the mask to the original clip, set the mask compositing mode to "muliply (mask)" and then apply a mask generator to it. THEN use pan/crop the decrease the size of the mask clip just a hair. You'll probably get a little green spill around the edges of the mask track then; just add a cookie cutter to the greenscreen clip and elimate the outer edge. But remove any FX you may have had on the greenscreen clip before you do.

 

[David Jimerson]

Did my advice help?

I did this one a few months ago as a demo for a sci-fi model building forum. Seems fairly similar to what you posted there -- I used the techniques above for the key.