In this lesson our instructor talks about compositing and green screen. First, he discusses alpha channels, compositing, using the opacity fixed effect, and using alpha channel transparencies. Then he talks about keying and using track matte key.
An alpha channel allows opacity in an image, either still or moving
Compositing is using alpha channels, either already present or created in real time, to overlay a different image into a video
Titles automatically have an alpha channel, which covers everything in the title except the actual words
Keying is a type of compositing where you choose a color to remove and replace
Blue and Green are the most common types
Blue for night scenes works best
Green for day scenes works best
Make sure your actors don’t wear the same colors as your screen!
A track matte is used to cover a track when you don’t have a specific color to screen out
Compositing and Green Screen
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
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