Bricks in Motion
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Video test of bat computer
https://youtu.be/Yuwyl-RUnw0
ANY ideas on improving the technique or should I scrap the idea and just use picture-in-picture ??? 
BYBatman]
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Off hand it looks pretty good, I don't know what software you are using, but you could consider adding some light wrap. slightly shrinking the mask, adjusting the levels of the alpha channel to make a cleaner key, and adding a holdout mask to prevent the keyer from affecting the rest of the image.
The biggest issue is that the angle of the computer does not match the perspective of the onscreen stuff. To fix this you need to add a perspective warp/four corner filter, or if you are using a software with 3D compositing (HitFilm, Blender, etc...) simply adjust the screen layer in 3D space to match the angle of the screen.
Personally, I'd go with picture-in-picture for monitors. The software I use (Hitfilm) includes a 3D planar tracking feature that is very useful for lining up the graphic with the screen such that it looks more like part of the actual scene. One interesting thing to note from the green screen test was that the way green keyed out, causing the graphic to look like it was behind trans-clear tile bricks. It's an interesting look to say the least.
Ha, is he looking at Batman ASCII art in his command console? The effect isn't bad. What I noticed right away is that the blacks in his monitor are darker than the blacks in the batcave. If anything, since the screen is a glowing object, it should look brighter and less contrasty than stuff in the real world. Also set-design wise, the bat shaped computer setup would be clearer without the black bricks in the distance behind it.
Ha, is he looking at Batman ASCII art in his command console? The effect isn't bad. What I noticed right away is that the blacks in his monitor are darker than the blacks in the batcave. If anything, since the screen is a glowing object, it should look brighter and less contrasty than stuff in the real world. Also set-design wise, the bat shaped computer setup would be clearer without the black bricks in the distance behind it.
If you can post an image of the raw greenscreen clip that would be great. It could be that you are not lighting the screen properly. Also, are you playing with the key settings at all? Its not always as easy as colour picking the colour and job done
I would change the dimensions of the screen to match what is being displayed
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