Wednesday 24 October 2012

Green Screen

To ensure the photos of the models look professional I will need to set up a shoot including some kind of green screen lit brightly as possible. However, because the front cover will involve the model standing (medium shot) it will be hard for there to be no shadows.

  • White Balance: Set to Flash or Manual WB using a gray card
  • ISO: Always use 100 (or lower if your camera goes lower) - High ISO values have more noise. Higher noise can cause a speckled transparency mask on the extraction. This is because some of the pixels from the green screen are less green (or not green at all) with higher noise levels.
  • Aperture - Use a wide aperture (lower number) - Similar to ISO, Using a narrow aperture leads to higher digital noise levels. Also, a wider aperture will reduce the depth of field and cause the green screen to be slightly out of focus. This also helps for a more uniform green colour to remove. We usually try to shoot with the F8 or less. 6.3 is the default value that we use for most of our studio shooting.
  • Shutter speed - This doesn't matter too much with flash photography as long as the shutter is open long enough to compensate for any delay between the shutter and the remote flash. The exposure will be set with the flash intensity and not the shutter speed. 1/60 or 1/100 sec should work fine.
Model should be roughly 6ft away from the green screen.

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