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The Algebra of Video Mixing: Alpha blending and color keying
Chris Bore
ASIN: B00O8RPRY0
Publisher: BORES Signal Processing
Pages: 95

This book is about Video Mixing: combining video, images or graphics from different sources onto a single destination, usually a display.Specifically it is about the algebra of video mixing - how it is defined and expressed mathematically - and how that algebra is implemented in practice.Mixing includes the two fields of alpha blending (transparency) and color keying (blue screening). The traditional term ‘compositing’ includes mixing but carries a suggestion of careful, thoughtful placement as well as the actual combining of images. The basic algebra I describe applies equally well to still images but I go on to discuss the restrictions imposed by mixing live video due to the way mixing hardware is implemented.The algebra of video mixing permits rich and subtle variations, most of which correspond to real visual effects. In practice very few are commonly applied and those that are can ...
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