Comments

Stonefield wrote on 2/12/2005, 11:50 AM
This is something I'd really love to see as well. HDV and keying.
Kula_Gabe wrote on 2/12/2005, 1:36 PM
I did a test when I first got my fx1.

It can be found at:

gabehoeffken.com/videos/hdv_choma keywmv.wmv

It was shot with almost no setup outside, on an overcast day, with a collapsable greenscreen leaned up against a garage door. No lighting was used other than the sun. I think I used 2ndary color corrector, and cromakeyer to pull the key. It was easier than any of the DV chomakey stuff I have done. I think this clip might be down sampled to 720p 24fps. Hope you find this helpful.

Gabe
mjroddy wrote on 2/12/2005, 4:37 PM
Thanks for the look Gabe.
Yes. Useful.
However, the key wasn't as perfect as I had hoped to see. I'm sure if you spent a ton of time with it, you could have done more, but there was noticable problems on the top of your subject's head, around the hair and fingers. With a couple back lights, that probably would have been cleaner. As you noted, you only used one light sourse. I was hoping to see a key as clean as what I've been able to produce with the BetaSP setup we use at work.
Still, I have to say that it's much, MUCH better than basic DV.
Thanks for sharing. Hopefully we'll see some more examples here soon.
Spot|DSE wrote on 2/12/2005, 5:49 PM
Beta will ALWAYS be better, just because of the analog format vs DV, BUT...
I've done fairly well in my experiments, and it IS easier than DV due to the expanded resolution.
I'll post some Chromakey green stuff when I return on Wed.
mjroddy wrote on 2/12/2005, 11:44 PM
Thanks Spot.
I have to admit, I'm MOST dissapointed to hear that we'll never get a key as good - even in HDV, as in BetaSP.
I was really hoping that, with the added resolution and then downsampling, (as has been mentioned here before) I had a non-Beta solution for keying.
Ah well. So much for some ideas I had.
taliesin wrote on 2/13/2005, 1:40 AM
Upsampling (it's not a downsampling) from 4:2:0 HDV to 4:2:2 is of no use. The color information lost when shooting in 4:2:0 cannot be restored by upsampling it later. What really helps is the Chroma Smooth filter of Vegas. Here again it doesn't matter whether you use your original 4:2:0 signal or an later upsampled 4:2:2 signal.

Marco
Spot|DSE wrote on 2/13/2005, 7:44 AM
mjroddy,
Analog for the most part, is capable of producing a better key simply because of the way it functions, but that's changing too. 8 bit is where the big challenge comes in. This is one of those places where I wish we had a 16 bit :-) editor.
Doesn't mean to say it's no good, just that it's a fact of the format.
mjroddy wrote on 2/13/2005, 7:44 PM
No. HDV - or even DV - isn't a bad format at all. Just not made for some of the things I want to do. Or, at least not do them seemlessly. Unfortunately, it's the only format I can afford.
Still, I also use the now-ancient PVR under Speed Razor and BorisRed. The PVR is a 10 bit editor - but only one stream. Give and take, eh. Now I'm kind of committed to Vegas and all my DV equipment. So I'll just have to figure out a way to shoot around keying - assuming it isn't suppose to look effect-y.
Thanks for helping me understand HDV and keying.