It's a little late, but this may be of interest. The words are not my own, I'm just passing them along.
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Remember the first weather men tried to super impose themselves in front of the weather map? They had that little line around them. That was because the 3-RGB layers of film were sensitive to the same wave lengths at the end of each color spectrum, thus you could see the cross over. Anyway the film industry change their blend to stop this crossover and created film that was too specific to spool and give to any ol soccer mom to shot it any where.
Uh, no. TV weather men have been chroma keyed electronically on video pretty much all along. The mattes have gotten better, but mattes were always electronic in regard to TV news. It wasn't until this video technology came around that weathermen got to be keyed into electronic maps. before that it was still video, but they used physical props. Nothing to do with the film industry at all.