-
Green Screen question
Keying some recent green screen footage. The greens were not lit as well as they could of been but still not bad results. I’m using dvGarage DV Matte to do the keying. I’m getting on well but one of the problems I’m having on one of the clips is that after I use screen fix to get the key as good as it can be and then putting on Matte pro plugin. I’m finding traces of white lines around the talent. After the initial key and tweaking the black & white points then adjusting the high & low points I get a quite convincing key. Then playing through the footage I see short white lines around the edges of the talent can’t seem to get rid of them. I have tried adjusting the V & H blur controls but if I go to far on the setting then I see the white lines. I’m also seeing jagged edges around the talent. I am using 1920x1080i footage in FCP6. Any pointers to getting this better?
Thanks -
12 Replies
-
Can you use the grab tool to capture a screenshot of the problem, and post it here?
-
-
It’s XDCAM footage.
I’m using dvGarage matte suit so when you say ‘choke’ do you mean blur the edges to try and blend the hard edges more? Because I have horizontal and vertical blur controls.
Is the footage problematic because it’s also inter-laced? We usually shoot progressive but for this job we had to use 1080i because of the camera the shooter shot on. For the future whats the best footage for keying?
Many thanks
-
Yeah I have Keylight 1.2 as part of AE but was doing this project in FCP6 so might have to do the whole thing in AE now then. The software hasn’t got a choker but have just tried a Nattress choke plugin and hasn’t done that much to be fair. I think I will have a go in AE to see what I come up with.
Many thanks for your comments! -
+1 on Keylight in AE, will do wonders for you.
Chris Tompkins
Video Atlanta LLC -
I will give the Keylight a go over the weekend. Would it make any difference in converting to ProRes first will it make the footage more keying friendly (losing the jagged edges a little?)
-
I wouldn’t, you can’t rez up. You’ll loose a generation actually, albeit slight.
Chris Tompkins
Video Atlanta LLC -
I’m using Keylight to key the footage. All the tutorials I’ve seen have the Screen gain at the default of 100% and when they select the green to be keyed the back ground disappears and the e.g the talent or foreground element keeps all its colour and tonal quality. When I do the same thing I seem to be getting noise in my subject (gain noise I think??) With that I’m losing definition in colour and contrast detail. Why is this is it just because the default gain is to high?
If I then drop the screen gain I start to lose the transparency of the green.If I go to screen matte view I can see clear contrast between the white & black areas but then going back to the final result view my talents clothing has lost the detail.
-
I’ll give that a go and report back!
Just out of interest I tried the footage in FCPX and it pulled a great key right off the bat, well impressed! Even the harsh edges have come out quite clean! I have also seen a technique for putting a ‘light wrap’ around the talent to help with blending into the BG so I might just export the keyed footage from FCPX and do the rest in AE.
The lighting was done by someone else on this occasion BUT yes I will definitely make sure that is sorted properly in the future. So I take it that because the green screen was lit to bright that the brighter colour information has affected and spilled into the talent thus resulting in the key not performing as it should?
Really appreciate your help on this one!
-
I can’t see the video anymore but I have to say that DVmatte Pro is actually a very good keyer and is exceptional at handling less than ideal codecs and lighting. Are you dropping your background into the plugin or just as a layer underneath it in the timeline. You will get much better results doing it in the plugin.
Reply to this Discussion! Login or Sign Up