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P2 footage for Blue Screen – Jagged Edges?
Hi all,
I recently shot with the PanaP2 using the 720/24p setting.
The whole shoot was a person in front of a Blue Screen talking.
When we went to key the blue screen out – the person’s edges were all jagged. We tried using both Primatte and Ultimatte as keyers.
Now, from what I know the P2’s 4:2:2 Bit Depth and it Progressive frame should give the best results for Blue Screen Keying – so why is it so darn hard to get a key with smooth edges.
Are we doing something wrong here.
BTW – everything was shot in the studio and lighting was good. It’s really just the edges of the person – they’re all jagged and pixelated.
Any enlightenment would help greatly.
Thanks
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4 Replies
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Keying using those options in what application? I have great luck with Keylight in both After Effects and Shake. You need to feather out the edges a bit. Keying is a tough thing at times.
Shane
Littlefrog Post
http://www.lfhd.net -
I’ve done a lot of keying lately (around 130 shots) with footage from the HVX-200.
You should remember that DVCPro HD is pretty heavily compressed. Also, the actual resolution on the chips is a little lower than 720, so it’s being upsampled a little bit in camera. Both of these can contribute to the jagged edges that you see.
If you’re keying your shots in Shake, then you might want to take a look at the keying tutorials that Andrew Shanks created for the Shake forum a couple of months ago. He has one lesson about blurring the U & V channels to improve the edges of your key. I’ve found that trick works really well with HVX-200 footage.
Arnie
Now in post: Peristroika, a film by Slava Tsukerman
https://www.arniepix.com/blog -
ALSO to mention, that the heaviest compressed color in DVCPRO HD is blue, so blue screening is not the best option. Green screen fairs much better.
Shane
Littlefrog Post
http://www.lfhd.net -
If you want to key HVX footage, I strongly suggest shooting those segments in 1080p. 1080p delivers the most resolution the camera can create, and results in much lower compression so you’ll have fewer “mosquito noise” artifacts around edges.
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