Learn the HDTV basics

bigup132 · Feb 26, 2007

Hey guys, i've been lurking on this site for a while learning all about firmware for the psp. Many thanks to the experts! I noticed that a lot of people don't really know the basics about HDTV so I thought i'd make my first post about this. Here is a great site to learn everything you need to know about HD..

Linky!!

I'm off to learn more from DarkAlex and the crew about this latest psp accomplishment. Hope this helps some of you out.

error5 · Feb 26, 2007

Thanks for the link. Right off the bat yesterday's HDTV calibration post rings true:

WHY HDTV CALIBRATION IS IMPORTANT

Calibration: Calibration is adjusting all the video output levels in the tv to give the best performance. Most people pull their newly acquired HDTV's out the box and never touch the adjustments. Some will go into the menu and adjust colors, contrast, brightness etc until they're satisfied. There are also DVD's out there that will help you "calibrate" your HDTV. Calibration allows your display to perform at its most optimal level as all the colors, blacks, contrast and other video levels are set to perfectly compliment each other. Outside of the regular menu on your remote, your TV also has a "service menu" which is usually accessed by a weird combination of button presses on the remote. Once there, things can get very confusing, as the settings have little meaning to the average person. Changing one setting here can greatly affect the video displayed, so it's recommended to not mess with this unless 1) You know what you're doing, 2) You've done major research on your specific model display or 2) You know someone who knows what they're doing.

The best way to calibrate your TV is to hire an licensed ISF technician. ISF stands for "Imaging Science Foundation." They are the industry standard to calibrating display screens. You can locate one within the united states by using this link: http://www.imagingscience.com/isf-trained.cfm. Expect to pay over $150 per input. This means your DVD player, satellite receiver and Blu-Ray player will all require separate calibration (providing that your TV has memory for independent inputs).
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bigup132 · Feb 26, 2007

Word! What i like about the site is that everything is explained for the non-technical person too, so everyone can understand complex issues.

diabolos · Mar 8, 2007

I feel this is the first and most important part of shopping for a new TV. If all my customers read this before talking to me I would be much happier (and they would be less confussed).

Formats and Resolution...

RESOLUTION & VIEWING DISTANCE: 480p, 720p, 1080i, 1080p

Pixel: The small tiny dots on the screens that make up the picture. The more pixels a screen has, the better the image. The screen you're looking at right now has lots of small pixels to make up the text, borders and images. Everything on screen right now, is a combination of different coloured pixels.

Resolution: The three types of HD resolution are 720p, 1080i, and 1080p. The numbers "720" or "1080" refers to the number of vertical pixels that make up the picture. The more pixels, the higer the resolution, and essentially the more detailed the picture. The letters (i) or (p) refer to "how" the picture is drawn on the screen.Just as you would measure a room in feet/inches and width/length, you measure screen real estate by the horizontal and vertical pixel count. Note that DVD's are standard definition with a resolution of 480p.

(i)Interlaced= in a fraction of a second, every other alternate line of the the picture is drawn on screen, and then another fraction of a second later, the other lines are filled in to create the full picture. This happens so fast, you can't see it, it looks like a complete picture. The image below shows an example of an interlaced scanned image on screen.

720p vs 1080i would create the argument that 1080i would be more detailed of a picture but 720p would be better at faster motion. For example, watching a football game on a 1080i screen, if the ball was thrown quickly across the field, the ball may blur due to the fast motion. This is a side effect of every other line of the picture being drawn as opposed to the whole picture being drawn at once.

720p vs 1080p would hands down mean that 1080p would deliver the same performance but the 1080p picture would be more detailed due to more pixels and essentially higher resolution.
1080i vs 1080p would have the same picture quality, but the 1080p screen may perform better with fast motion.
720p= 1280 lines of Horizontal pixels by 720 lines of vertical resolution with the picture drawn progressively. (1280x720)
1080i= 1920 lines of Horizontal pixels by 1080 lines of vertical resolution with the picture drawn with the interlaced method. (1920x1080)
1080p= 1920 lines of Horizontal pixels by 1080 lines of vertical resolution with the picture drawn progressively. (1920x1080) 1080p is now the subject of marketing jargon such as "TRUEHD" or "FULLHD." Just remember, HD has 3 resolutions and their use is determined by how close you'll be, and the size of the screen.

Native Resolution: So you're thinking about buying a 720p screen, but it says that it "accepts" (480i, 480p, 720p, 1080i, 1080p). What does that mean? Well the screens native resolution is 720p, that means that no matter what source you use, whether VHS, DVD, HD-DVD, Blu-Ray (we'll get to that later), the tv will take whatever you're plugging into it and either "upscale" or "down-convert"to 720p. If you play a dvd that outputs at 480p, the tv will take that signal and do its best convert it to 720p. To an extent that is. The result will be far from HD, but depending at how good the tv's internal scaler is, the results will differ. Similarly a 1080i source, say an HD broadcast from your cable company will be downconverted to 720p. If you take an old photo from the 1800's and scan it into your pc, no matter how good your photo editing software is, it will only be so good. HD scaling runs off the same type of principle.
Viewing Distance and screen size: So 1080p is better than 720p an 1080i right? So why not just always get 1080p? Most likely you would get 1080p 10 times out of 10 if cost wasn't an issue. But the fact of the matter is that after a certain distance, you may not notice the benefits of 1080p. Now the rest is very subjective, and you will need to see for yourself. It also depends on how picky you are. A general guide, is that the bigger the screen, and/or the closer you are to it, the more detail your eye might demand, so there is more need for 1080p. The smaller the screen, and/or the further away you are from it the less detail your eye may recognise, so 720p may suffice. Notice i'm using the word "may/might" a lot, as perception is subjective and unique to each individual. Don't let someone else tell you what you can and can't see, no matter how far you are from the screen. If you're 10ft away from a 32" 1080p screen, chances are that you won't notice the difference between 720p and 1080p. But if you're less than 7ft away, it would be more likely that the difference is more noticeable, even on a 32" screen.

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Ced

bigup132 · Feb 28, 2007

Jah man! I completely agree with you there. If everyone knows the basics it will defintely allow them to make more educated purchases.

bigup132 · Mar 8, 2007

Just out of interest, what did you guys think about the site?

diabolos · Mar 8, 2007

I think its well done.

Ced

error5 · Mar 8, 2007

I also thought the site was informative especially for beginners.

But what happened to bigup132????

Edit: Now I know what happened. He should have realized that you just can't threaten another member with bodily harm:

http://forums.afterdawn.com/thread_view.cfm/478623

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