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color keying behind glass
Can anybody give me any tips on how best to green screen behind a glass window. I understand that reflections is something to keep in mind. Should I shoot the reverse of my subject and overlay that layer where the window is. I could use a blue key if I do this cuz I hate green spill.
Any suggestions would be greatly appreciated.
cheers. -
2 Replies
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It may be better to tell us your end goal. Do you want to keep the sheen off the glass, or are you trying to get a reflection?
If you want a reflection, don’t need the glass. Shoot whatever you want the reflection to be and map it where the key will be and drop the opacity. You will want to distort the image though. Also if your camera rotates around the window it may give away the reflection doesn’t move correctly. You can animate the reflection to move opposite from your camera move to give the illusion though.
If you just want the sheen and light reflections, then put glass over your key. You only need a key to get good edges so the midle doesn’t matter. After you get your key, use that key to isolate the original footage. Turn it greyscale and play with levels and transfer modes to map your reflections and light hits back onto whatever you comped in.
Chris Smith
https://www.sugarfilmproduction.com -
cheers chris for the reply. I’m looking for the sheen and light reflections so I will place my color key behind the glass. It’s a car passenger window through which I see the footage. The subject is sat infront of the window but the camera is static. When I turn it greyscale should I mask to the window area or the entire frame after keying it. does that matter when trying different overlays or blending modes.
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