720 P only?

I see advertisements selling HDTV as 720 P. Does this mean that it is
not capable of showing HD that is being transmitted via 1080p? If it
makes no difference then why advertise as 720P?

"noel888" wrote in message
...
I see advertisements selling HDTV as 720 P. Does this mean that it is
not capable of showing HD that is being transmitted via 1080p?

It will show 1080p scaled to 720p.

If it
makes no difference then why advertise as 720P?

Because that is the native resolution of the TV.

I'm sure at some point there will be a high-end TV that will natively do
both 720p & 1080p the same way computer monitors can do multiple
resolutions. This will be for the hard-core crowd who will accept 720p HD at
720 only and 1080i/p the same way.

On Oct 2, 4:53*pm, "Andy from Dover" wrote:
"noel888" wrote in message

...

I see advertisements selling HDTV as 720 P. Does this mean that it is
not capable of showing HD that is being transmitted via 1080p?

It will show 1080p scaled to 720p.

If it
makes no difference then why advertise as 720P?

Because that is the native resolution of the TV.

I'm sure at some point there will be a high-end TV that will natively do
both 720p & 1080p the same way computer monitors can do multiple
resolutions. This will be for the hard-core crowd who will accept 720p HD at
720 only and 1080i/p the same way.

How would something like that be built?

If you think about it, displaying 720 on a 1080 screen in 1:1 mode
will simply use a subset of the screen. Of course people would
complain and then they'd have to scale the 720 up to 1080. Wait, they
already do that. It can actually look very good if the arithmetic is
done right.

Barring that, you'll need 2 TVs

G²

"noel888" wrote in message
...
I see advertisements selling HDTV as 720 P. Does this mean that it is
not capable of showing HD that is being transmitted via 1080p? If it
makes no difference then why advertise as 720P?



some older sets are indeed only 720p - they will downscale 1080i broadcasts
( tv broadcasts are not 1080p ) and 1080p sources - blu-ray/game console to
720p.
some tv broadcasts are 720p too but you'd do just as well to buy a 1080p
set.



--
Gareth.

that fly...... is your magic wand....

"Andy from Dover" wrote in message
...


I'm sure at some point there will be a high-end TV that will natively do
both 720p & 1080p the same way computer monitors can do multiple
resolutions. This will be for the hard-core crowd who will accept 720p HD
at
720 only and 1080i/p the same way.




CRT monitors can do multiple resolutions as they don't actually have a fixed
resolutions.
lcd and plasma sets do so to do both 720p and 1080p natively they would need
a very large resolution that both of those divide into exactly.


--
Gareth.

that fly...... is your magic wand....

"The dog from that film you saw" wrote in
message ...

"Andy from Dover" wrote in message
...


I'm sure at some point there will be a high-end TV that will natively do
both 720p & 1080p the same way computer monitors can do multiple
resolutions. This will be for the hard-core crowd who will accept 720p
HD
at
720 only and 1080i/p the same way.




CRT monitors can do multiple resolutions as they don't actually have a
fixed
resolutions.

These are the rear projection sets or large CRTs for those who attach them
to dual-mono tube amplifiers.

lcd and plasma sets do so to do both 720p and 1080p natively they would
need
a very large resolution that both of those divide into exactly.

Not that large after all as it's 2160 lines (2160/2=1080 2160/3=720). And
these sets will be ready for 2160p SHDTV. ;-)

"Andy from Dover" wrote in message
...


lcd and plasma sets do so to do both 720p and 1080p natively they would
need
a very large resolution that both of those divide into exactly.

Not that large after all as it's 2160 lines (2160/2=1080 2160/3=720). And
these sets will be ready for 2160p SHDTV. ;-)




what about the horizontal? - i'm too lazy to figure that one out.



--
Gareth.

that fly...... is your magic wand....
http://dsbdsb.mybrute.com
you fight better when you have a bear!

On Sat, 3 Oct 2009 18:00:38 +0100, "The dog from that film you saw"
wrote:


"Andy from Dover" wrote in message
...


lcd and plasma sets do so to do both 720p and 1080p natively they would
need
a very large resolution that both of those divide into exactly.

Not that large after all as it's 2160 lines (2160/2=1080 2160/3=720). And
these sets will be ready for 2160p SHDTV. ;-)




what about the horizontal? - i'm too lazy to figure that one out.

Since these resolutions use square pixel ratio, the horisontal number
of pixels (3840) is also integer multiples (2 and 3) of 1280 and 1920.

One problem with the "easy to display" idea conserns the 1080i format
used in broadcast where the content is truly interlaced. It is true
that each half frame of 540 lines can be "line quadrupled" to fill all
lines but to shift the "quadrupling" 2 lines for the next half frame
will give us back the line twitter we know from the old days with CRT
displays that did not have any picture processing.

Furthermore, also with progressive material it might not be the best
compromise to just repeat pixel values. It might be better to scale
using filter functions (as is done today).

The reason for wanting higher resolution is to be able to sit closer
to a larger display. The very sharp pixels from a flat panel gives a
noticable stare case effect from slanted edges when the pixel size in
the panel is resolved by our eyes.

I find it clear already now when comparing panels with 768 or 1080
vertical pixels that I get less disturbed (and can sit somewhat
closer) by using a panel with a pixel size that can not be resolved vs
a panel where I resolve the pixels in the panel. This is true also
when watching material with a lower resolution than the panel.
/Jan

When my 1080P HDTV gets a 720P broadcast, the picture is less sharp than the
channel that does 1080i (with no sub channels).

Rather than buying an inferior TV, I think you should just shop around for
the best price on a 1080P. Tried Walmart?