rear projection with 1080 24p footage

P

pvfilm

Member
Hello all,

I apologize in advance if this is the incorrect forum for this post.

I am shooting a short film with HVX. We have shot B roll which will be rear projected for several scenes in a ghetto studio set up. The studio is 40x18ish. The principal footage is 720pn and the projected footage is 1080 24p.
Has anyone here done anything like this before?
The theory is we will use final cut to project the images in 1080. Testing tomorrow.

What kind of projector should we use?
Talent will be set up 4-5 feet in front of the screen.


What about using a silk instead of a rear projection screen?

Any information will be helpful.

Thanks,
Jennifer.
pvfilm@gmail.com
 
You would need a projector with a whopping Lumens rating. To get your projected image to cleanly show up on the camera, and have enough light to capture your talent cleanly, the projector needs to be bright, bright, bright! Get the brightest projector you can rent. As far as projecting in 1080 I wouldn't worry about that too much as you need to set FCP to View>Ext Video> Cinema Desktop Preview and if you have the firepower sure, do 1080 but I don't see how that will change the image being recorded back to the camera any different than 720p.
 
I just projected some rear screen 1080 and 720 footage yesterday on a shoot and it looked very very good. Just be aware that like Geno said, you need a projector with a good lumen rating. The one we had was 3500 lumens.. which is pretty good and would probably be a basic or lowest level projector I'd recommend. The 6K lummen one I rented before was very very bright and looked awesome.


As far as having the subject in front of the screen.. you'll have to experiment with that to get the optimal distance.. but one thing to remember is that to fill a screen you need the projector to be 1.5 times the distance to the screen in relation to the width of the screen. So, if you have a 9x12 screen like I had yesterday, the projector is 18 feet back behind the screen to fill it. Now, there's a bit of wiggle room, but that's the standard set-up.

The only other thing is to make sure that your screen is totally stretched and without wrinkles. I sometimes tie it off to something else on the supports to pull it wider....


I think that the grey screen would serve you best.. This is like how they did this stuff in old-time hollywood. Also, is there a reason, you aren't shooting green-screen?

Can ya show us the results when you are done.... Would be very cool to see.. Thanks
 
rear projection

rear projection

Thanks Gino and Justin,

Good tips. We are using a grey 12x9 grey screen and I am hopeful for a 6000 lumen projector. If not 6000 we would use 4200 lumen.

The picture calls for rear projection not green screen. There are miniatures of the bay bridge and boats and things that come into play. Pretty ambitious project for a no budget short.

I'll let you know how it turns out.

Thanks again.
Jennifer.
 
Hey Guy's

Seeing the kwality of the HVX 200 cam on this movie makes me horny, I can hardly wait to get it. This is a great diference with my PD170 from sony.

Greeths,
Guy
 
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