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Uhd |
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#1 |
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Forum Member
Join Date: Nov 2008
Posts: 267
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Uhd
So with most new TVs available being 4K or so
Just what programmes are available in uhd/4K The only ones I've seen are sky sports footy but you need the Qbox as well are there any others ?? |
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#2 |
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Forum Member
Join Date: Sep 2005
Location: Hetton le Hole, UK
Posts: 695
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Quote:
So with most new TVs available being 4K or so
Just what programmes are available in uhd/4K The only ones I've seen are sky sports footy but you need the Qbox as well are there any others ?? |
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#3 |
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Forum Member
Join Date: May 2005
Location: Redditch Worcs
Posts: 17,287
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Satellite Astra SES UHD demo channel on 28.2E. Available on Freesat 998 with suitable TV's.
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#4 |
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Forum Member
Join Date: Mar 2002
Location: Oxford
Posts: 12,689
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There are several UHD TV channels on many satellites see here - http://en.kingofsat.net/ultrahd.php
Mostly demo/test channels but a couple of FTA channels including Fashion 4k and a sports channel and a couple of subscription channels. To view these you will need either a motorised dish of the appropriate size for the satellite they are on OR a fixed dish you can align on each in turn. You will also need an UHD capable satellite receiver or a TV with satellite tuner and "4k" decoding capability and DiSEqC capability. The only place you will view 4k is in the cinema - all broadcastss and internet streams are UHD which is almost but not quite 4k. TV broadcasters/manufacturers have hijacked the "4k" term and wrongly applied it to their UHD. |
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#5 |
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Forum Member
Join Date: Oct 2003
Location: Darn Sarf
Posts: 28,724
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Quote:
The only place you will view 4k is in the cinema - all broadcastss and internet streams are UHD which is almost but not quite 4k. TV broadcasters/manufacturers have hijacked the "4k" term and wrongly applied it to their UHD.
O/P, although this is in the satellite board it's relevant to a UHD TV question to mention that BT TV has a UHD sports channel 'broadcast' via 'fibre' internet connections and that's a cheaper way of getting into it than via Sky TV. Quite a few people have both as well as Netflix, Amazon and Blu Ray 4K UHD, and having all of them is one way of maximising a UHD set usage for UHD. |
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#6 |
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Forum Member
Join Date: May 2005
Location: Redditch Worcs
Posts: 17,287
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'4K' TV is 96% accurate though, which for 'the industry' is pretty darned good! Especially when you recall that they pick numbers simply because they are as misleadingly big as possible, and 4K cinema itself is only 97.6% accurate a description. Under the previous vertical resolution convention that most people are used to, it would have been 2160p so '2K' ... but we can't have the public realising that it's only twice the linear spatial resolution of HD now, can we... <rolleyes>
O/P, although this is in the satellite board it's relevant to a UHD TV question to mention that BT TV has a UHD sports channel 'broadcast' via 'fibre' internet connections and that's a cheaper way of getting into it than via Sky TV. Quite a few people have both as well as Netflix, Amazon and Blu Ray 4K UHD, and having all of them is one way of maximising a UHD set usage for UHD. |
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#7 |
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Forum Member
Join Date: Oct 2003
Location: Darn Sarf
Posts: 28,724
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Perhaps they should have called it 4XHD, as it is exactly 4 times the number of pixels of FULL HD (x 2 horizontally and x 2 vertically). When you consider the size of a cinema screen and when you sit in the front rows the detail you can perceive on a UHD TV is going to look a lot sharper than a cinema screen.
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#8 |
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Forum Member
Join Date: May 2005
Location: Redditch Worcs
Posts: 17,287
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It's funny isn't it, what you can do with numbers. For example, I could correctly point out that UHD TV has a mere 3.75 x the vertical resolution of DVD and SD TV channels, which puts a rather different complexion on it than saying it's 4 times the pixel count of full HD...
![]() Comparing FULL-HD 1920 x 1080 (PAR is 1:1 - square) and 2160P (par is 1:1). One UHD pixel is 1/4 size of a pixel on a Full-HD display. Therefore in most ways of looking at it it's 4 times the resolving power of Full-HD. The same applies to stiil digital cameras. |
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#9 |
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Forum Member
Join Date: Feb 2002
Posts: 20,366
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Sky Q is getting BBC iPlayer UHD content in time for Christmas.
Just demo material to begin with. |
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#10 |
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Forum Member
Join Date: May 2005
Location: Redditch Worcs
Posts: 17,287
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That ignores the physical size and aspect ratio of the pixels. 16:9 576i (PAL DVD) has 720 x 576 pixels but to fill a Full-HD display they have to be stretched horizontally. ie the PAR is not 1:1 square. One pixel in the signal does not map to a single pixel on the screen.
Comparing FULL-HD 1920 x 1080 (PAR is 1:1 - square) and 2160P (par is 1:1). One UHD pixel is 1/4 size of a pixel on a Full-HD display. Therefore in most ways of looking at it it's 4 times the resolving power of Full-HD. The same applies to stiil digital cameras. |
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#11 |
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Forum Member
Join Date: Oct 2003
Location: Darn Sarf
Posts: 28,724
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Quote:
That ignores the physical size and aspect ratio of the pixels. 16:9 576i (PAL DVD) has 720 x 576 pixels but to fill a Full-HD display they have to be stretched horizontally. ie the PAR is not 1:1 square. One pixel in the signal does not map to a single pixel on the screen.
Comparing FULL-HD 1920 x 1080 (PAR is 1:1 - square) and 2160P (par is 1:1). One UHD pixel is 1/4 size of a pixel on a Full-HD display. Therefore in most ways of looking at it it's 4 times the resolving power of Full-HD. The same applies to stiil digital cameras. The comparison with full HD is 2 times in both the vertical and horizontal plane. I don't multiply them to do areal comparisons as they are a bit meaningless really, whatever the 'industry' want us to think. Comparing resolution in one plane only makes more sense simply because twice the resolution means you need to sit at half the distance to gain all the benefit, and vice versa. Also, in optics, that's how it's measured - for good scientific reasons too. |
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#12 |
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Forum Member
Join Date: May 2009
Location: Northumberland
Posts: 280
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Sky Q is getting BBC iPlayer UHD content in time for Christmas.
Just demo material to begin with. |
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