Re: Chroma Keyer / 'Green Screen'

On 19 Jan 2008 01:43:40 -0700, "Adrian" <adrian99@xxxxxxxxx> wrote:


Hello all,

Does anyone know of any good articles on the theory of Chroma
keyers, Background Extraction, Color Keying, 'Green Screen', type
of effects?

I have been searching for a while but I have not found very many
at all..

I don't know of any articles bhe the prinicple is simple: Replace
pixels of a certain color with the corresponding pixels from another
image.

You probably want a bit of flexibility in the definition of the color
to account for shadows and the like.

Lets say your chroma-key color is blue. Look at the RGB values of the
pixel.

If (Blue > 50) And (green / blue < .1) and (red / blue < .1) then
SubsistutePixel;
.

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