High Definition TV will reach your TV in one of two way. You can receive it over the air from your local TV stations for free (see article on what HD programming is actually available on the big broadcast networks) or through your cable/satellite provider.
When I refer to cable here I am referring to cable or satellite (like Dish TV, for example).
There are many cable networks that now have a separate High Definition version of themselves. Examples of these are TBS, TNT, A&E, Food Network, etc.
Keep in mind that just because these channels are supposedly all high definition, the truth is most are not. Keep in mind that these channels are showing current programming but in many cases reruns as well. TBS for example, shows reruns of Seinfeld, King of Queens, and other sitcoms and dramas that were never produced in High Definition. So how could a station like TBS broadcast them to you now in HD if they weren't produced in HD. The answer is, they can't. So in order to fill up the whole HDTV screen (remember it is a 16:9 ratio), they stretch the 4:3 picture to fit. Because the stretching originates from the source broadcaster, you have no control over it. You can use your TV's controls to "unstretch" it but that never works very will and you are left with black bars on the side and a picture that now looks squashed instead of stetched. There's just no way to win.
On the contrary, there are lots of HD channels including TBS that run either original programming or reruns that were produced in high definition. For example, TBS airs "House of Payne", an original sitcom, produced in HD. TNT airs "Saving Grace" and "The Closer" where this is also true. And they air reruns of shows like "Law and Order" and "The Office" which were originally produced in HD. So if a show was originally produced in HD and is airing on an HD network, you are truly seeing HD programming.
Let's go back to you local TV station for a minute. My local NBC affiliate airs "Law and Order" in the afternoons (because NBC has absolutely no daytime programming other than "Day of our Lives" so there's lots of room for reruns and/or "judge" shows). My local station can't record and play back at a later time, HD programing (see earlier posts). So in this case I am watching a channel that is HD capable and I'm watching a show that was produced in HD, but my local station can't record that show and play it back in HD so I end up with a plain old digital program with black bars on the side. I hope that makes sense.
The next example of HD is what I call "Fake HD". There are HD Channels out there like Discovery HD, Food Network HD, Science Channel HD who commit even bigger sins. There are certain shows on these networks that are broadcast in a strange format. It is as if they re-recorded a 4:3 program in close up and the outcome is that it ALMOST fills up the screen. It was originally a 4:3, non-HD program. They cleaned it up or something to get the picture to be a bit crisper, then zoomed in on it so make the picture bigger. But if you look, there are still black bars on the sides of the screen. The are smaller and a lot less noticeable than the typical black bars, but they are there.
The last and in my opinion the worst kind of HD programming is what I call "Horizon HD". On some HD Television sets, you can stretch a 4:3 picture to 16:9 (stretching) but everything looks a little off, so there is another setting called "Horizon Stretch". It's hard to explain but the picture is stretched out in a strategic way, not quite stretched evenly, to give the illusion that people are objects aren't so stretched. That's the best way I can explain it. But as the camera moves, let's say it pans the room, the picture looks like there are two rolling pins underneath the screen giving a wavy or undulating appearance. It can make you sea sick. And with all those makeover shows on TLC and HGTV where they pan the room before and after, Horizon HD is NOT a good choice. I find I must change the channel when I come upon these shows.
The moral of this story: HDTV is not necessarily HD so be careful what you're willing to pay for.
Stay tuned for more.
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