Looks like the HVX200 is pretty capable of good keys at DVinfo.net

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Old January 11th, 2006, 07:00 AM   #1
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Looks like the HVX200 is pretty capable of good keys

Greenscreen footage by Dan Parsons. Composite by Rodrigo. From the DVXuser boards.

http://img300.imageshack.us/img300/7...00033018fl.jpg

http://img300.imageshack.us/img300/7...00033018fl.jpg
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Old January 11th, 2006, 03:17 PM   #2
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Nice jpeg. I wonder what the footage looks like when played.
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Old January 11th, 2006, 05:30 PM   #3
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The detail around the hair leaves a bit to be desired. I've seen better results using DV and dvGarage's dvmatte.
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Old January 12th, 2006, 12:27 AM   #4
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Here is the key I pulled tonight in Shake:
http://www.gleb.zerobrains.com/dmitr...HVX_key_1.tiff
The screen wasn't lit evenly, the left side is darker, and realistically I would pull two different keys with Keylight along with Primatte for the base matte. Also, there was a bit of white outlining on the right side around the ear, I'm not sure if that's PNG or the sharpness setting set higher on the camera, but I had to chew in slightly on the ear with eroding (yum, lol). Other than that this is great footage, really. I'm quite impressed with HVX.
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Old January 12th, 2006, 02:44 PM   #5
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Quote:
Originally Posted by Carl Firth
The detail around the hair leaves a bit to be desired.
I've noticed that too, from the various stills I've seen. (Even the one on the Tosh blog.) The edges seem to have blocking artifacts, particularly in the vertical direction, which I find surprising considering the 4:2:2 sampling. One would expect there to only be a slight 2-3 pixel blocking in the horizontal direction only.
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Old January 12th, 2006, 03:18 PM   #6
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Quote:
Originally Posted by Carl Firth
The detail around the hair leaves a bit to be desired. I've seen better results using DV and dvGarage's dvmatte.
Actually, the hair is probably what I was most impressed with. Here's my shot that I did with just a little bit of tweaking in Keylight:
http://www.onlinecheckregister.com/green.jpg

As soon as I dropped keylight on that clip the hair just popped right out. If I were to finish that particular shot I'd actually have to work with the slight ringing going on with that ear and the bit of a dark fringe on the left side of the face. Still, a pretty good key considering how quickly it was created. Plus I used a very unforgiving background. I seem to recall that the guys that shot the footage did it very quickly with little setup too.
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Old January 12th, 2006, 06:01 PM   #7
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Quote:
Originally Posted by Philip Williams
Here's my shot that I did with just a little bit of tweaking in Keylight...
I think that's a bit better. I especially like the way the fine hair on the back of the subject's neck remains intact.

BTW, I don't want to sound too harsh in my critique. Even with some minor artifacting, I think all of these keys have been excellent.
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Old January 13th, 2006, 01:59 PM   #8
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Quote:
Originally Posted by Earl Thurston
I've noticed that too, from the various stills I've seen. (Even the one on the Tosh blog.) The edges seem to have blocking artifacts, particularly in the vertical direction, which I find surprising considering the 4:2:2 sampling. One would expect there to only be a slight 2-3 pixel blocking in the horizontal direction only.


This concerns me too! Anyone care to take a guess why this 4:2:2 key is doing this.

Michael Pappas
Arrfilms@hotmail.com
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Old January 13th, 2006, 02:00 PM   #9
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one other note...

I am very impressed with the detail in the eye's.
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Old January 13th, 2006, 02:11 PM   #10
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Originally Posted by Michael Pappas
This concerns me too! Anyone care to take a guess why this 4:2:2 key is doing this.
Is there a chance that people might be expecting too much from the 4:2:2 color space? I seem to recall an ILM interview where the guy complained about having to work a lot harder to key the 4:2:2 stuff in Episode II as compared to the 4:4:4 stuff in in Episode III.

I mean, yeah 4:2:2 is going to have a lot more color info than 4:2:0 or 4:1:1 but its still basically tossing a lot of the original color info.

Personally I didn't see any show stoppers when I dropped the footage into After Effects. My main problem on this particular shot was getting good transparency on the arm/hand when it waves. But I don't believe that was codec related but rather general lighting/setup related.
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Old January 13th, 2006, 02:32 PM   #11
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Quote:
Originally Posted by Michael Pappas
one other note...

I am very impressed with the detail in the eye's.
Michael,

Yep...It is impressive.

I dont know how to explain this technically...
I mean, this camera seems to perform a lot better in real life than on the rez charts...The image's texture is definitely Exquisite

Could it be the pixel shift patern ?

I know it is speculation, and i am not a tech guy, but...i am trying to understand why the HVX can, at the same time, be an average rez chart performer, but makes real sharp and defined real world image.
I just ...like it very very much.

Anyway, i think they're all good.
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