if you subscribe to a cable or satellite TV service chances are there's a toggle
somewhere on your set top box that allows you to switch between 720p or
1080 I but you've also probably noticed
that most TVs and monitors advertise
themselves as 1080p these days which doesn't match up with either of those so
what gives you see that P you always see
at the end of 1080p stands for
Progressive and no I'm not talking about the insurance company or Bernie Sanders
I'm talking about progressive scan which means it will draw all of the lines in a
single frame of video sequentially so that each frame contains a complete
image that fills the screen by contrast
the little I stands for interlaced in
which only every other line of an image
is displayed in one frame interlaced
signals are common not only for 1920x 1080 TV channels but they were also
dominant back in the day of analog television where almost everyone was
watching at 480i or 576i on CRT
displays but why wouldn't it be more
straightforward to display one whole image per frame well part of the reason
was bandwidth you see only so much much
data can be flung over the airwaves or a
co-axial cable at Once interlaced video
saves on bandwidth by only sending half of a complete frame at once this allowed
older TV sets to refresh more frequently
for smoother motion as they could show 60 half frames per second instead of 30
full frames but modern LCD flat panel
TVs only support Progressive scanning so
how do they work then with interlaced 108i signals provided by cable or
satellite TV services well the signals
have to be what is called deinterlaced this can be done by either
the set top box or the TV itself but
either way it's an imperfect science you
see the two halves of a fully interlaced
frame aren't two halves of the exact
same image rather they are usually
delivered as the halves of two separate slightly different frames so when you
put them together they don't look quite perfect and on lowquality displays this
can show up as what's called combing in places where the two half frames don't
match up very well TVs use processing
tricks to help avoid really bad artifacting in deinterlaced video and
generally it works fairly well on displays that are worth their salt and
although many cable boxes can also de interlay signals it's typically a better
idea to let your TV do it as cable boxes are all too often made by the lowest
bidder and the de interlacing logic inside them won't be as good as what
your tv offers but even with a nicer TV
it can still be possible to notice a reduction in picture quality when
there's rapid movement on screen such as if you're watching a sporting event
because two half frames in sequence
during something like a hockey game can be way out of sync due to the fast
motion of the players many sports networks like ESPN have actually chosen
to broadcast in 720p instead of 108i sacrificing
resolution for better movement but come
on lonus this is 2016 why do we have to
sacrifice anything well due to the cost
of upgrading systems as well as the fact that most Bourgeois viewers seem to be
content with 1080i service we probably won't see real 1080p at 60 frames per
second over cable and satellite anytime soon however the good news is that
computers have no problem outputting 1080p signals so if you're one of the
many folks who are constantly using their rigs for everything from gaming to
watching Netflix in HD or even 4K you won't have to worry about interlacing
artifacts yet another reason to join the PC Master raced just make sure that you
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