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Posted by Jeff_BTFP on 06/20/06 23:01
Thanks....I'm going to watch again this week.
The show, btw, is So You Think You Can Dance on FOX.....Broadcasting at
8pm EST Wednesday and Thursday here in NYC....
Thanks,
JEFF
Pat Horridge wrote:
> "Richard Crowley" <richard.7.crowley@intel.com> wrote in message
> news:e6rs2e$dv5$1@news01.intel.com...
> > "Jeff_BTFP" wrote ...
> >>I do concert video (projection/to tape), and had a question regarding
> >> an effect I saw on TV last night, and what it's benefits are.
> >>
> >> The show used a lot of moving lights, and I noticed in certain
> >> situations when the moving light was pointed directly at the camera, a
> >> black spot would appear in the middle of the light source (lamp). I
> >> interpret this as some kind of a Luma Key.
> >
> > Not necessarily. It could be an artifact of the camera pickup
> > device, or the circuitry anywhere along the line. Sometimes if
> > something is TOO bright (like the very center of a light aimed
> > directly at the camera, the brightness "folds back on itself"
> > and appears to be black. Or sometimes this shows up as a
> > vertical streak (black or white) from the bright spot all the
> > way to the top of the picture, and all the way to the bottom.
> >
> >> What are the benefits of using this? Is this just some piece of
> >> hardware the network puts in place to make sure that the video is
> >> broadcast safe??
> >
> > Dunno of any "benefits"? In fact it can be rather dangerous in
> > terms of the camera pickup device (tube/solid-state sensor).
> > For the same reason you shouldn't look at the sun, etc.
> >
> >> As you can tell, I know very little about TV Broadcast....If you could
> >> help me out or point me to a website that goes more in depth, I'd
> >> appreciate it greatly.
> >
> > Not sure exactly what you are asking?
> Very unlikely to be an incamera issue as this would be a big problem.
> Not a CCD issue as Richard said overload would give vertical lines.
> I suspect there was some post digital processing that was overloaded.
> If the digital word is too big there is a danger of the most significant bit
> being lost and making the resultant value very small.
> I'd supect a bit of downstream processing and not a very well built bit of
> kit at that.
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