After Effects
Chroma key compositing, or chroma keying, is a special effects / post-production
technique for compositing (layering) two images or video streams together based
on color hues (chroma range).
The technique has been used heavily in many fields to remove a
background from the subject of a photo or video – particularly the newscasting,
motion picture and videogame industries.
A color range in the top layer is made transparent, revealing another image behind. The chroma keying technique is commonly used in video
production and post-production.
This technique is also referred to as color keying, color-separation overlay,
or by various terms for specific color-related variants such as green screen, and blue screen – chroma keying can be done with backgrounds of any
color that are uniform and distinct, but green and blue backgrounds are
more commonly used because they differ most
distinctly in hue from most human skin colors.
No part of the subject being filmed or photographed may duplicate a color used in the background.
Example
TASK 1
Editing green footage
download video from youtube
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