Greenscreen 720p vs. 1080p
Hi!
I am using EX1 for greenscreen shots. If the final video will be 720p is it better to shot 1080p or 720p and then scale in post? Thanks for reply |
1080p will give you the ability to scale up the subject if needed. I tend to always shoot 1080p for chromakey, even for video destined for web projects.
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Generally a larger picture will produce cleaner edges. The problem will be downscaling and keeping that quality.
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I think I would take the time to do a TEST with my setup, subject matter, and workflow to determine what really worked best for a particular project.
Better safe than sorry... |
If your end video is going to be shown in a 4:2:2 environment, shooting at 1080p and downscaling to 720p will, in theory, get you better colour resolution as you'd have been shooting at 4:2:0 but by shrinking those big blocky colour pixels, you're getting close-as-makes-little-difference to 4:2:2.
Having said that, by using a chromakeyer that also uses luminance info to get a better key (in my case, DVmatte Pro), I'm happy with the results from 720p - which has less pixels but the same bandwidth and in my experience has less issues with fast motion. It's also much quicker to work with. As an example, here's a quick 'mood board' for a recent job that (from about halfway through) demonstrates fairly quick and dirty (no light wrap, no proper colour correction) keys from 720p footage: I did do a project way back that was all 1080p, and quite frankly, once it got to delivery, I preferred the 720p results, and have pretty much stuck with 720p ever since. But I think DVmatte Pro has made a huge difference due to its use of luminance info to make the key: dvGarage - dvMatte Pro |
Could it not be better to record in 720-50P than 1080 -50i or 25P. Less blurrry edges and better keying.
Havent tried it but it should be considered. |
Do a search of this forum. I posted some samples and descriptions of what was done for my greenscreen shots.
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Quote:
Also keep in mind that "motion blur" of lower frame rates can also result in problems when clean edges are needed. Of course faster shutters speeds can help that a bit. |
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