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Post by philwjan on Nov 7, 2006 7:04:14 GMT -4
I agree Kiwi, the page is really good apart from the color/BW issue.
As a teacher I know the problem of didactic reduction (literal translation, is there such a thing in English?). i.e. dumbing down things enough to make them comprehensible but short of making them factually wrong. In doubt I'd opt for no explanation rather than a factually incorrect one.
Philipp
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Post by philwjan on Nov 6, 2006 10:42:50 GMT -4
Hi,
and thanks for the kind welcome.
I understand, real life sometimes sucks and keeps you from all the important things. Maybe he'll eventually find the time again an find this interesting.
I'll definitely stick around for a while!
Philipp
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Post by philwjan on Nov 6, 2006 7:45:40 GMT -4
Hi, first off all, this is a great site with a staggering amount of resources that should be enough to finally rid all these silly conspiracy theories (well, we all know, this will never happen, but one can dream though ) On the page www.clavius.org/tvqual.html titled "Technology - Television" I found a little imprecision regarding the reduction in the amount of data by reducing a TV signal from color to BW. It is not like you assert, that all three colors use the same amount of bandwidth, thus a BW broadcast only using a third of a color one. Much rather a technique called croma subsampling is being used. Other than your example postulates no RGB-Signal is used, but a composite signal of a full-resolution luminance channel and two chrominance channels with lower resolution (YCbCr). While the luminance channel will carry the full frequency (every pixel has its own luminance value), the chrominance information is only transmitted with half or a fourth of the frequency. This is usually expressed as ratios in the form of 4:2:0. This is used in television and means that the chroma subchannel is half the frequency of the luminance channel. The chroma information alternates from line to line between Cb and Cr. Thus I would think that the amount of bandwidth needed to transmit Color TV should roughly be 150% of that needed for BW. The estimation of 66% savings due to the BW seems a bit excessive to me. As a starting point for further information see: en.wikipedia.org/wiki/Chroma_subsamplingWhile this is in no way intended to either encourage any Hoaxer's criticism in this website, I think that we should try to be as precise as possible and have our facts as well together as we can. Cheers, Philipp
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