What is HD? The difference between 720p, 1080i and 1080p
Jan 09, · The Answer: SuperUser contributor Rsp goes into great detail explaining the differences between p, i, and when one is preferable over the other. Mar 23, · While p video is definitely preferable to i, it’s also worth noting that unless you’ve got above-average eyesight, you probably won’t be able to notice a difference between .
Buying a new TV can be a fun-filled adventure — but how to dress like a guy for girls an agonizing nightmare. But what do they mean? As far as TV lingo goes, the more pixels there are, the better the picture quality. To understand why, though, we have to look at each resolution a bit more closely. Only then can you start considering what screen size is best and finally start taking a look at our list of the best 4K TVs to find the television of your dreams.
From a proper viewing distance, thousands of them blend to make the image on your screen. For a while now, p has been the industry standard for high-definition displays, and most content that is, television broadcasts, shows, and movies is produced and distributed in p.
This is considered a high pixel density. That has changed in the past few years, as UHD TVs have become affordable for even cost-conscious consumers, resulting in studios caving and churning out 4K material left, right, and center. This is everything from 4K home security cameras to 4K gaming monitors.
So what does all this mean? Well, first of all, it just looks better — a lot better. Lines will be sharper, curves will be smoother, and the level of detail will be far greater. Plus, manufacturers these days are fully focused on creating high-quality 4K TVswhich means they often boast improved tech, like support for high dynamic range HDR color. They say 8K is on the waybut this resolution is insanely expensive for now.
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Feb 16, · Even today, there still seems to be some confusion about the major differences between i and p. So, let’s dig into the basics. Keep in mind . Difference Between SD and HD HD of High Definition is a term that is most often used to describe TV sets and videos that have higher resolutions compared to the standard. Standard definition TV sets and video are commonly called as p, referring to the rows of pixels from top to bottom. HD usually contains or rows [ ]. We’ll get on to the difference between i and p in a bit. Promise! The real plus of having a p TV set have over a p one is when it comes to watching Blu-ray movies.
The i your cable box sends out is the same number of pixels that your p TV has. There still seems to be some confusion about the difference between i and p. Both are 1,x1,pixel resolution. Both have 2,, pixels. From one perspective, i is actually greater than Blu-ray. True, i and p aren't the same thing, but they are the same resolution. Let the argument commence Let's start with p, as it's the easier to understand. OK, p is 1,x pixels, running at 60 frames per second fps.
The first, in the late '90s when all this was happening, there were no p TVs. Sure, we all knew they were coming, but it was years before they started shipping now, almost all TVs are p. The other big way was the sports. Both ABC and Fox have big sports divisions, which played a big role in their decision to go with p.
This is because when it comes down to it, fast motion looks better at 60fps more on this later. The i designation is 1,x1, pixels, running at 30 frames per second. The math is actually pretty simple: at 30fps is the same amount of data as at 60 or at least, close enough for what we're talking about.
How, you might ask, does this 30fps work on TVs designed for 60? With modern video processing, the frame rate doesn't matter much. Back in the olden days of the '90s, however, we weren't so lucky. The image is actually "interlaced. What this means is that even though there are 30 frames every second, it is actually 60 fields.
Each field is 1,x pixels, every 60th of a second. Of the 1, lines of pixels, the first field will have all the odd lines, the second field will have all the even lines. Your TV combines these together to form a complete frame of video. What about p? Yes, what about it? Your p TV accepts many different resolutions, and converts them all to 1,x1, pixels.
For most sources, this is from a process known as upconversion. Check out my article, appropriately called " What is upconversion? When your TV is sent a i signal, however, a different process occurs: deinterlacing. This is when the TV combines the two fields into frames. If it's done right, the TV repeats each full frame to create 60 "fps" from the original If it's done wrong, the TV instead takes each field, and just doubles the information.
So you're actually getting 1,xp. Many early p HDTVs did this, but pretty much no modern one does. In a TV review, this is the main thing we're checking when we test deinterlacing prowess. If only it were that easy if that is even easy However, there's a problem.
Let's take the example of the sports from earlier. ABC and Fox very consciously made the choice to go with p over i. As we said earlier, this largely wasn't based on some limitation of the technology or being cheap. It's that i is worse with fast motion than p. At 60 frames per second p , the camera is getting a full snapshot of what it sees every 60th of a second.
With i, on the other hand, it's getting half a snapshot every 60th of a second 1,x every 60th. With most things, this isn't a big deal. Your TV combines the two fields. You see frames. Everything is happy in TV land. But let's say there's a sportsball guy running across your screen from right to left. The camera captures a field of him, then a 60th of a second later, it captures another field of him. Uh-oh, he wasn't nice enough to stand still while this happened.
So now field "A" has him in one place represented by half the image's pixels and field "B" has him slightly to the left represented by half the image's pixels. If the TV were to combine these two fields as-is, the result would look like someone dragged a comb across him.
Conveniently, this artifact is called combing. Using sports images gets their respective organizations' feathers all ruffled. So instead, here are two frames from a video I took. I named him Fred. Obviously Fred wasn't moving fast enough to get combing artifacts this bad, but this should give you an idea what's going on.
The TV's deinterlacing processor has to notice the motion, as in the difference between the fields, and compensate. Usually it does this by, basically, averaging the difference. In effect, fudging the edges. Yep, that's right, it's making stuff up. Or, if you want to argue it differently, it's manipulating the image so there's no artifacts, at the expense of absolute resolution.
Don't worry, though, TV processing has gotten really good at this and usually does a lot more than just "averaging" so the result is rather seamless. Now this is where an argument about p -- real p -- becomes worthwhile.
A full frame-per-second p video would be awesome. Not because it's a higher resolution than i, but because it's a higher frame rate and not interlaced , so motion will be more detailed. However, it's highly unlikely most people would ever see a difference. Compression artifacts in the source or edge enhancement in the display are far more detrimental to the image than deinterlacing.
Reducing either of those two factors would have a bigger effect on the image. So with full p, the subtle increase in motion detail isn't likely to be noticed. Movies and the beauty of Movies are, and will be for the foreseeable future, 24 frames per second. Sure, James Cameron , Peter Jackson , and even Roger Ebert want to up the frame rate, but that's going to be an uphill battle. When it comes down to it, people equate 24fps with the magic of movies and higher frame rates with the real-world reality of video.
Changing people's perception is a lot harder than twisting a dial on a video camera. Note that I'm not arguing for or against higher frame rates here. Maybe in a future article. As we've discussed, this is actually less than i. This is most often due to other factors, like compression. At least, not yet. It maxes out at wait for it i! Funny how that works. Those of you astute at math will be wondering: how do you display 24fps on a 60fps display?
Not well, honestly. The trick is a sequence of frames colloquially referred to as , from pull-down , the method used. When shown on a 60Hz TV, they're arranged in a pattern, like this:. The first film frame is doubled, the second frame is tripled, the third is doubled, and so on. Although this means 60Hz TVs can operate with minimal processing effort, it results in a weird judder due to the bizarre duplication of frames. This is most noticeable during horizontal pans, where the camera seems to jerkily hesitate slightly during the movement.
Ideally, you'd be able to display duplicate frames without the sequence. One of the potential advantages of and Hz LCDs is the ability to display film content at an even multiple of 5x in the case of Hz, and 10x in the case of Hz.
Sadly, not all or Hz TVs have that ability. Some plasmas have the ability, but in many cases, it's a flickering 48Hz 96Hz is way better, and offered on some high-end models.
As an aside, the Soap Opera Effect is the TV creating frames to insert in-between the real film frames to get up to or Hz. This results in an ultra-smooth motion with film content that makes it look like video.
People fall into two distinct categories when they see the Soap Opera Effect: Those who hate it and want to vomit, and crazy people just kidding. For more info on this, check out " What is refresh rate? But what about games? As I discussed in my " 4K for the PS4?