In this session,we acquired the basic skills on the purpose and use of the green screen, specifically the importance of lighting and setting up the camera/screen correctly. This was followed by an IT session on compositing and keying.
We started the session with the basic three-way set up with correct lighting, and formed a long shot focusing on the subject so we could composite this later in a second workshop. I soon learned the importance of lighting your subject correctly when using a green-screen, as any spill as a result of poor lighting creates problems when it comes to editing (as I found in the compositing workshop)
Compositing Workshop
Keying
Keying is the process of isolating a single colour or brightness value in an electronic image and using software to make that value transparent, allowing another image to show through the affected areas. Luminance keying, or luma-keying, is the process of keying out a brightness value or range, like black or white. Luminance keys are often used for applying mattes. Colour keying, or chromakeying, identifies a specific colour to remove.
In order to isolate one area from the rest, the background colour must be distinctly different. Bright green beats blue partially because it is not a colour normally featured or worn by the subject and is the furthest away from natural skin colour. Any clothing that matches the background too closely will also key out, making gaps in your subject, or making it disappear altogether.
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