Guide to Green Screens 8

green screen

What is Green Screen?

Green Screens are the painted cloth hung at the back of a stage as part of a scenery used in chroma key photography. This screen is used to replace the green colored background with some another background scenery.  Some scenes require chroma key photography in which the background has to be replaced like for example the weather forecaster on TV standing in front of the map, that screen is replaced by the green screen.

Now, why is the screen always green or blue in color. Because separating a solid color like blue and green if the subject is human because the color like green and blue are not found in human body skin tone.

Replacing the background is not that difficult task. All that you’ll need to get started is:

  1. Digital camera.
  2. A computer
  3. Chroma key photography software
  4. Green screen background.
     Here are a few tips on how you can select the green screen background according to your work requirement.
    • The size of the green screen according to your need.(5’x7′ or 10’x12′ or 10’x20′)
    • Portable screen
    • Stationary screen
    • Material (paper, fabric, painted wall)stay away from glossy or shiny materials.
  5. Background stands
  6. Background stands
  7. Digital backgrounds

Steps How to get started:

  1. To set up the green screen if a portable stand is in use make sure that the stand is stable so that it doesn’t flap in the breeze or move with any slight wind movement.
  2. Make sure there aren’t any wrinkles on the green screen you are using. If you are using a cloth for green screen make sure it is tied tightly to avoid any wrinkles or folds as the wrinkles, folds or lines would cause a shadow in your background.
  3. Set up lighting for the green screen, make sure that there aren’t any shadows or hot spots. Croma key works best with the background having uniform lighting.
  4. Select the digital background for the shot.
  5. Set up your lighting for your subject.
  6. Position your subject. Make some distance between the object and the green screen so as to avoid any shadow casting between the screen and object.
  7. The object should be completely in front of the screen, any part if not in front of the green screen will have a different background, and removing that unwanted background would be very time-consuming.
  8. Transfer the shot from the camera into the computer.
  9. Now all you have to do is start removing the chroma screen using the chroma key photography software eg: Adobe Aftereffects and so much more.

Now, enjoy the result of your first try using green screen photography and digital backgrounds. 

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