Tutorials

Filming on a Green Screen

One of the most important steps is lighting your green screen properly. While you obviously need to concentrate on lighting your subjects, unwanted shadows and dark spots on the screen behind them can be difficult to key out in post-production. The perfect key comes from a clean, evenly exposed backdrop.

You can make your life easier by using diffused lights. If you use harsh lights without diffusion, you’ll get an uneven spill. It’s also important to use two of the same type of light so that you can avoid two different fills or temperatures, which would make things very difficult for your editor. However, it’s okay to use two different types of lights for your subject and your screen — provided you light the screen evenly with two of the same type of light. (Side note: be sure to get rid of any distracting or reflective props exposing the green screen before you roll cameras.)

Keying Out the Green Screen (Tutorial)

Adobe After Effects

  1. Create a new composition in After Effects by dragging your video clip into the ‘Composition’ icon (you can send any footage you have in CS6 or CC to After Effects via a dynamic link)
  2. Under ‘Effects & Presets’ search for the term ‘keylight’ and apply to your video clip by double clicking it
  3. Now click the ‘Screen Color’ eye dropper tool and click on the green screen section of your image
  4. Now switch the view from ‘Final Result’ to ‘Screen Matte’
  5. Scroll down to the ‘Screen Matte’ section and open the menu.
  6. Tweak the ‘Clip Black’ and ‘Clip White’ settings until the background is completely black and the foreground subject is completely white. Keep the ‘Clip White’ and ‘Clip Black’ settings as far away from each other as you can without introducing spotting
  7. Switch the view back to ‘Final Result’ and you will see a much cleaner key!
  8. You can also adjust the ‘Screen Shrink/Grow’ settings which should remove some of the rougher edges.

Tips

  • Get it right first time: In order for a green screen to be used to it’s maximum potential it should be lit evenly with no wrinkles or dark spots on it.  Also your subject should be about 15 feet away from the background to avoid shadows or green spill.
  • Keying out the green screen is just as important as lighting your background.

Adobe Premiere Pro CC


 navigate to Video Effects > Keying > Ultra Key. Set the output to “composite,” then you’ll be able to choose your key color, which in this case will be green. After this, you’ll be given a few different options for image control under “Matte Generation.”



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