On Thu, 15 Mar 2001, Bryan Pope wrote: > > > > >>>>> "BP" == Bryan Pope <bpope@wordstock.com> writes: > > > > BP> I believe it can also be used to replace a color in the > > BP> video stream with computer graphics. (The weatherman in front of > > BP> the animated weather map). > > > > No, that's called chroma keying. Same principle though. > > > But doesn't a genlock do both video overlay and chroma keying? Or do you > need a separate piece of hardware for chroma keying? It has been a *long* > time since I worked with this type of equipment. But we did use Amigas! :) The amiga video port has a /PIXELSW as well as a XCLKEN signal pair. If you separate the sync from your video signal, take the horiz and synthesize 28mhz (?) from it, and feed it into the video port, and take your separated horiz and vert sync's and feed them into the output with XCLKEN, the amiga will switch its internal oscillator off and use yours so it can sync to your signal. Now all you need to do is switch between the amiga and your video signal. ;) Thus, PIXELSW. Whenever a non-background color is displayed, pixelsw indicates that amiga video is active. Voila. Genlock. Amigas have been able to do chroma keying via an addin card and time base corrector. This, however, isnt stock hardware. -jb - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi.
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