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Hi!

Has anybody tryed to use big modern TV as background projection? I am planing sets for my new film. I have to build scifi city and one option for set addition could be ~75'' TV. Those are relatively cheap and it would be much easier to deal with than projector. Propably set extensions made in postproduction is the easyest aproach, but this background projection method could bring some nice extra light and reflections to the shots.

https://www.youtube.com/watch?v=Ufp8weYYDE8


This Mandalorian style studio backscreen coluld be one solution. Has someone tryed this aproach? Biggest concern would probably be contrast, luminosity, reflections, distance between TV and real set etc.

-Tatu

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I tested using my old 30" Apple computer monitor as a background once.  The idea was that I could easily advance the frames one at a time with one of my image editing programs.  

The resolution was 2560 pixels wide, better than the 1920 HD I wanted to finish the film in. A 4k TV, or more recent 5k monitor, would give you higher resolution.  

I didn't have any problems with the puppet reflecting on the glass, but the re-photographed image was very contrasty compared to the original image that was being displayed on it.  I think it could work if you adjust the colour and contrast of the image until it comes up looking right.  If you cn do this with the monitor settings that would be best, it would save having to make a special version of the background plate, and probably you would have to do it several times until you got it right.  I didn't take the time to experiment with this, I just shot the puppet against green screen since I already had that set up.  No saved images to show you, I just looked.

Great, too much contrast is easyer problem than not enough. Let's see, we might try it.

I tried it not long ago and found that in order to have sufficient dept of field to shoot a picture with a sharp rendering of the background and the puppet still in fokus I had to have a long exposure which made the background way to bright. So in my case I didn't have enough light on the set, and the lens should have been a lot more light senchisive, in the first place. Because I didn't have a better lens and more light to give I turned down the monitor brightness witch resulted in a obscure coloured background.

I posted the result here: search for "dynamation"

Dynamation in Tahoma2d

Great to see some tests! Can you give some specs from your monitor/TV? Was it normal computer monitor? What was light intensity etc.?

-It's a smart tv (too smart for my mother) I used an HDMI output from the computer to the TV. Frankly, I don't know the resolution or much other.

But I fought with it for the better of three hours, before giving up upon getting a decent picture, and just started to animate a little, for the sole purpose of documenting the whole setup.

I ended up lowering the brightness on the monitor after having fiddled with Tahoma2D for quite some time, trying to achieve the exact same. I was actually in the midst of rerendering the whole background sequence, before realizing that the TV of cause had a setting made for that. I worked the brightness down to somewhere between 20-30% which made it really dark but made me able to work with the longer exposures, avoiding the background getting totally blurred. The backside was the equal loss of color information and control thereof.

I'll try again at some point. But I think that a composition in post will prove a better workflow for now. At least to my earned experience, it will give a LOT more control!!

In the end, I'm a little discouraged about the back projection. But utilizing a projector to add moving ambient light to the set, is absolutely amazing. You should look into that!! I've posted some tests of that as well.

Best regards - hjw

Thank you for the info. Low lumiosity of videoprojector seemed to be part of the problem.

Animated light from projector made nice effect.

I wouldn't worry much about the low luminosity of the projector - even if the light is not really noticed while working on the set, the effect will show up when played back! But you're right, the cheap ones aren't really that strong, but strong enough for our purpose.

Tatu P said:

Thank you for the info. Low lumiosity of videoprojector seemed to be part of the problem.

Animated light from projector made nice effect.

Using a screen to make a selected area "green screen" could reduce the spill of green on the set and character. Actually the mandalorian setup was what got me started with the dynamation test project. Forgot about the green screen part. So cool that you posted this☺️

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