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Forums Broadcasting Dimensions of B/G for Green Screen

  • Dimensions of B/G for Green Screen

     Mark Suszko updated 12 years, 5 months ago 2 Members · 2 Posts
  • Michael Barnes

    August 7, 2008 at 9:47 pm


    I am shooting a webcast for a local newspaper. I am using the Sony HDV Z1 camera. I am a little rusty on green screens. The graphic designer is designing the background for a 8 x 12 green screen. He wants to know what size in pixels to make the file. I’m clueless. Can anyone help?

  • Mark Suszko

    August 11, 2008 at 1:53 pm

    More pixels is always better. In this case, I say you want as big a file as you can handle, because when you shoot green screen and want to cut to a closeup from a wide shot, it is nice to have the replacement footage be big enough that you can zoom it in a little without creating visible pixelization.

    This sells the viewer that the background is real, because the subconscious expects to see a shift in the width/size of the background when you cut to a closeup. Chromakey backdrops that remain at one size, while the talent in the shots changes, are a dead give-away.

    The larger image also allows for control in x and y of the relative positions for best composition.

    As to how big to make a green screen backdrop, you really only need it to be very slightly wider and taller than the subject you want to show: the rest you remove in post with mattes and garbage masking.
    Don’t forget to make a green floor if you want real full-body shots.

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