HVX200 for greenscreen work

Patryk_Rebisz

Patryk_Rebisz

Veteran
I'm about to start shooting this educational DVD where i'll have the talent on greenscreen and then in the post i'll have to replace the greenscreen with white and colorful images. I was thinking of shooting in 720p but have reservation on how good the camera is for greenscreen work. Anyone care to share some experiences?
 
Yeah, the HVX 200 works fine for greenscreening.
I would go 1080p, short exposures, light carefully,
and blur your chroma before pulling the key.
 
patbooyah said:
yes, please elaborate on blurring the chroma!
Click to expand...

If you're using FCP, it's easy. Just pop in the Keying > Color Smoothing 4:2:2
filter BEFORE your key.

The idea is that DVCPROHD is a 4:2:2 codec, which means that every
luminosity pixel (Y') is recorded, but the color information is sampled
at half the rate, so you have groups of two pixels with identical Cb and Cr.
Which means your jaggies will be even more jaggy. By blurring only
the color information, you keep the luminosity detail, and smooth
those jaggies before the keyer does its work. It's a way of faking 4:4:4.

This article has an illustration of chroma blur for Vegas:
http://amediaprof.com/content/index.php?option=com_content&task=view&id=21&Itemid=27

One more thing: turn OFF sharpening on your camera when you shoot greenscreen.
 
Last edited:
stuckfootage said:
If you're using FCP, it's easy. Just pop in the Keying > Color Smoothing 4:2:2
filter BEFORE your key.
Click to expand...

Thanks for that. I read your post 10 minutes before doing greenscreen work and did a quick test before continuing to film and although dont really see any difference on screen it seemed to work wonders when keying in AFX!

So thanks....

Wish I had noticed the last line though - oh well.
 
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