HMI and Green screen

[Ernie Santella]

Your question is a bit confusing? What are you asking? HMI lights are daylight balanced (most of the time, slightly above daylight temp.) If you are using ungelled HMI’s with a green screen, your key and fill lights just need to be balanced to match them. If everything is balanced color temp-wise, then you’re good to go.

Shooting on DVCProHD is just a a format, like HDCAM, BetaSP etc, that doesn’t make any difference. The only thing to concern you is, is every thing matched correctly… Camera color balanced to the lights, the ratio of source to the background, all the lights color balanced equally etc.

Are you asking something else?

[Robin Probyn]

Hi there

Thanks for the reply.Yes I know DVCpro is a format,I have my own HDX900,just thought I put it in as extra info.

Yes you have answered my question.. just had a thought if from the editors/post side of things if they had a preference for tungsten or if anyone had some quirks with having green screen lit by HMI,s

Didnt think they would but just interested to hear..

Thanks again

[Robin Probyn]

Hi Ernie

What would be your recommendation for foreground to back ground lighting ratio,s..

Thanks again as always for your help.

[Maurice Jansen]

hi there

ernie said

Shooting on DVCProHD is just a a format, like HDCAM, BetaSP etc, that doesn’t make any difference.

that’s not completly true doing Chromakeys with a 4:1:1
format is harder than with a 4:2:2 format (DVCpro is 4:1:1)
so if you have a choice try to find a format in 4:2:2

maybe an external recorder on the output of your camera

greet
Maurice

[Maurice Jansen]

oops

forgot that DVCproHD is 4:2:2

you have a good setup

[Robin Probyn]

Well it was a question about Green screen in post.. you might just want to have a nice cool drink..

peace and love

[Dennis Size]

Assuming you’re lighting your greenscreen and your talent BOTH with HMI sources you should be fine. Just balance accordingly.

I would diffuse the HMI scources heavily. Light tough spun (Rosco #106) would be my diffusion of choice on the greenscreen.
I would diffuse the talent HMI’s with light tough spun and 1/8 CTO …. and also perhaps Cosmetic Highlight (Lee 188).

DS

[Robin Probyn]

Thanks Denis

Yes the HMI,s will be through silks,or diffusion frames.. like the idea of the 1/8 CTO for the hero..

Many thanks

[Mark D’agostino]

I tend to light my greenscreen to about a 1/2 – 1 stop below key. I also found that adding green gel actually gave us a better key.
I shoot with an HDX900 and have found we have to work a bit harder to pull perfect keys because DVCProHD is compressed evn though it’s 4:2:2. In theory, (since we don’t own one), a camera using an AVC Intra codec would propbably do a better job pulling keys but we own the 900 and its shoots beautiful pictures so we make it work for the green screen stuff. I’m be curious if anyone else agrees with that.

Mark D’Agostino
http://www.synergeticproductions.com

[Dennis Size]

You should aso backlight your hero with either 1/8 or 1/4 CTO — and a 1/4 minus green or even Lee 188 (Cosmetic Highlight diffusion), to minimize the green bounce rimming his/her heroic actions. It sounds like you’re going to have a lot of light hitting that greenscreen.

DS