Analyzing the HVX framegrab.

Darkline

Darkline

Veteran
Is it me, or does the image look badly keyed? not around the womans hair but the sides of the car are pretty bad... it definatley shows huge erosion of the bonet and dark blocks that are keying/semi transparent artifacts.

The bonet reflection is now brown, which in my experience would be where the greenscreen has reflected in the bonet and part of the green colour has been keyed away unfortunately with chunks of the bonet on both sides of the car (right side looks worse)
You can clearly see the reflection of the couple in the bonet, and the muddy brown is the reflection of the greenscreen behind the subjects... This produces the semi- transparent artifacts/colour blocks that have also fallen into the tolerance of the green key and been partially removed accidentally.

Hence the eroded edges of the car itself (these look like black patchs as you're seeing the background image come thru to the foreground image) This shows up the blocks of green (now brown) colour, which I guess would be the DVCPROHD compression on the green channel. Interesting to see.

Some of you may think it doesnt look that bad, but trust me, if that background was anything other than a very dark blue, you'd see it come shining through both sides of the bonet with flickering chroma artifacting.

That said, I'm not making judgement of anything on this singular image; it could be just a bad attempt at a key..... maybe a 2 pass key process could have handled it better (one that isolates the green reflection and hue shifts it). It's interesting to see tho and I sure wouldnt have posted this as a first good example of HVX keying abilities with all that artifacting.
 
Well, yeah it's pretty clearly a key. The nutty background would be the first tip-off, given the other images on the page where you see the background as a greenscreen (though brightened up to a light grey by the camera's flash, looks like)

But yeah, I agree with you, not a great key. Hopefully the fault of the compositor and not the camera...

The headlights also have the standard Photoshop/After Effects lens flares on them.
 
Remember, no one ever said that this is an example of final output. It could very easily be a simple test, and is more than likely not the final shot.

Don't forget that this image isn't something that Panasonic is advertising as "look what the HVX can do" - they've simply been kind enough to let us in on the production of the first HVX music video.

Some of the complaints with this image have revolved around aesthetics and our personal opinion - which has no real relevance to 'judging' the image since Michael will obviously be making the footage look the way the Director wants it to look.

There are just too many unanswered variables surrounding that image to make any form of realistic judgment.
 
The title of this thread is analize. That's exactly what it's doing. Was that intentional? :thumbsup:
 
yes i would hope its not the final composite either.

the only reason i post the topic is because I was hearing on this forum how it wasnt great aesthetically, but technically it was a good example of keying 'look at the fine hair' etc.

For me the 4:2:2 of the HVX was a reason i was holding back on the other HDV cams. Keying was of particular interest to me. So as a first ever HVX image I thought it was worth mentioning. I think everyone is too busy looking at the girl that no one noticed how badly the bonet was keyed :-) maybe thats good 'direction' and not bad keying.

oh and sorry for the typo, but if it brightens people's day up then thats cool.
 
harlan said:
Some of the complaints with this image have revolved around aesthetics and our personal opinion - which has no real relevance to 'judging' the image .
Click to expand...

well thats why I post the comment as it's purely a techical observation.

I personally hope the final composite key's them on the front of a rollercoaster for maximum 1980's david hasslehoffesque effect; you can get away with bad fringing then...
 
I agree that the hood has a bit of a problem, but that doesn't even impact the scene as you are watching the music video, you are watching the girl and the guy. I believe that Mike only dropped it into FCP and hit the key and did no more fine tuning thatn that. If he had been more tuned to the car and not the girl and the guy, he may have lit the car differently or tweaked the key differently, yet as far as the music video goes, you don't even notice it. But for the keying experience I think the hair is the better part of the key and showing what 4:2:2 can do.

Best,

Jan
 
Mr. Blonde said:
Bottom line is it's an ugly frame though, I wouldn't hire that guy as my dp.
Click to expand...

Well.....this may be just a dirty quick key before final composite.
Lets not judge the camera too quickly becuase of an ugly greenscreen.
 
I would never judge a camera based on a frame grab with keying ...

Maybe they "wanted" that edgy effect, yes it really looks like it was intentional.
 
it is a key with many issues, I am sure its not a final key, unless it's meant for SD ..
 
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