[opendtv] Re: 4KTV at CES
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 15 Apr 2013 21:50:03 +0000
Richard C. Ramsden wrote:
> Frankly, the average consumer can't see the difference. They have
> never trained their eye to see it. Video professionals don't see
> like most people.
Did you watch Mark Schubin's presentation? Consumers back in the early 1900s
couldn't tell the difference between a live performance and one recorded on 78
RPM records played on mechanical phonographs. Moral of the story being,
consumers get trained automatically, as the improved media are introduced.
Few people these days would confuse AM sound, typically limited to about 3.5
KHz in AM receivers (due to the 10 KHz band limit of AM stations), with FM
sound. Few these days would confuse HDTV with NTSC 4.2 MHz video bandwidth.
The case for 4K is actually reasonable. It brings the image resolution in line
with what a good but still affordable lens can deliver, on a large format (say
18mm X 24mm, like 35mm movies) image sensor. This would be a digital format
that does what film was able to do for a very long time. Extract all the
quality you can out of the lens.
4K mean 3840 X 2160 pixels, or 8.3 Mpel image. A good 35 mm lens averages about
70 lp/mm of resolution, across the frame. So in a movie format, that's the
equivalent of about 8.5 Mpels.
Bert
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