http://www.digital-media-tech.com/softmasking.htm Softmasking Softmasking, alpha channel, or alpha composting is a channel/process used in graphic software to combine an image with a background to create the appearance of partial transparency. It is very helpful in rendering different image elements in separate passes, and then combining the resulting multiple 2D images into a single, finished image. Softmasking is used widely for combining computer rendered images with live footage.
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http://www.digital-media-tech.com/softmasking.htm
Softmasking Softmasking, alpha channel, or alpha
composting is a channel/process used in graphic software to combine an image with a
background to create the appearance of partial transparency. It is very helpful in rendering different image elements in
separate passes, and then combining the resulting multiple 2D images into a single, finished image. Softmasking is used widely for combining computer rendered images