Re: Can you tell the difference between 720 and 1080? I can't.
- From: Alan F <afiggatt1@xxxxxxxxxxxxxx>
- Date: Fri, 03 Aug 2007 18:29:56 GMT
NadCixelsyd wrote:
Brief back story: In July, 2006, I purchased my first HDTV, it was a
32"-720P (native) which was at my summer cottage which was OTA only.
When I closed my summer cottage, the 720P set was brought home and
hooked to Comcast. I could see the Comcast compression, so I dumped
cable and went OTA only. I've since added a 46"-1080P set. I'm quite
happy with both.
While I did notice a difference between cable and OTA-720P, I can not
find any visual difference between 720P and 1080i (nobody broadcasts
in 1080p). I can't tell the difference whether it's live TV or
through my DVR. I normally view these from 8-10 feet, but even at 3-4
feet, they look the same. Note: I've never viewed these sets side-by-
side, but I have watched the same programs by walking to the other TV.
I've never seen a 1080P signal, so what I say here is just theory:
When I'm in a movie theater at 24 frames per second, I can NOT see a
flicker. I can't conceive of a difference between 1080i (even at 24
frames per second) and 1080p (at 60 frames per second). I'm trying to
understand why people are so demanding of 1080p when 1080i appears
99.999% as good.
Recent threads here show that a lot of people do not understand the
difference between 1080i and 1080p, for starters. Since almost all fixed
pixel displays are progressive, they deinterlace the 1080i signals. Then
we get into reverse 3:2 pulldowns for film source material, which make
up the bulk of TV shows. Anyway, another topic.
35mm and 16mm film movies are typically shot at 24 fps, but they are
projected at 48 fps to reduce flicker. Each frame is displayed twice by
the projector. This has been done for a very long time. The next time
you are in a theater, look carefully at fast motion scenes. You will see
the effect of 24 fps.
The general consensus is that in a normal living room setup, sitting
at 10 feet, that you really can't see the difference between a 1366x768
display (as this is common display resolution) and a 1920x1080 display
at 50". The 1920x1080 resolution only really comes apparent at big
screen sizes, say 60" and up.
The human eye has, for someone with good vision, an angular resolution
of 1 arc minute. Have some fun, do some trig and figure out what the
angular size is in arc minutes of your TV screen is when you are sitting
8' from the screen.
But I should ask, how is your ATSC tuner set up? Does it pass through
720p and 1080i natively or does it output only 1 format, rescaling the
other? If it has only 1 format output option, you are not really seeing
the difference between 720p and 1080i.
Alan F
.
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