This article's does not adequately key points of its contents. Please consider expanding the lead to of all important aspects of the article. Please discuss this issue on the article's. (April 2017) High-definition television ( HDTV) is a television system providing an image that is of substantially higher resolution than that of. This can be either analog or digital. HDTV is the current standard video format used in most broadcasts:,. HDTV may be transmitted in various formats:.

(HD ready): 1280×720p: 923,600 pixels (0.92 MP) per frame. (full HD): 1920×1080i: 1,036,800 pixels (1.04 MP) per or 2,073,600 pixels (2.07 MP) per frame. (full HD): 1920×1080p: 2,073,600 pixels (2.07 ) per. Some countries also use a non-standard CEA resolution, such as 1440×1080i: 777,600 pixels (0.78 MP) per field or 1,555,200 pixels (1.56 MP) per frame The letter 'p' here stands for, while 'i' indicates. When transmitted at two megapixels per frame, HDTV provides about five times as many pixels as SD (standard-definition television).

The increased resolution provides for a clearer, more detailed picture. In addition, progressive scan and higher frame rates result in a picture with less flicker and better rendering of fast motion. HDTV as is known today first started official broadcasting in 1989 in, under the /Hi-Vision analog system. HDTV was widely adopted worldwide in the 2000s. Further information: and The term high definition once described a series of television systems originating from August 1936; however, these systems were only high definition when compared to earlier systems that were based on mechanical systems with as few as 30 lines of resolution.

The ongoing competition between companies and nations to create true 'HDTV' spanned the entire 20th century, as each new system became more HD than the last. In the 2010s, this race has continued with, and systems. The British high-definition TV service started trials in August 1936 and a regular service on 2 November 1936 using both the (mechanical) Baird 240 line sequential scan (later to be inaccurately rechristened 'progressive') and the (electronic) Marconi-EMI interlaced systems. The Baird system was discontinued in February 1937. In 1938 France followed with their own system, variants of which were also used by a number of other countries. The US 555-line system joined in 1941. In 1949 France introduced an even higher-resolution standard at, a system that should have been high definition even by today's standards, but was monochrome only and the technical limitations of the time prevented it from achieving the definition of which it should have been capable.

All of these systems used and a 4:3 except the 240-line system which was progressive (actually described at the time by the technically correct term 'sequential') and the 405-line system which started as 5:4 and later changed to 4:3. The 405-line system adopted the (at that time) revolutionary idea of interlaced scanning to overcome the flicker problem of the 240-line with its 25 Hz frame rate. The 240-line system could have doubled its frame rate but this would have meant that the transmitted signal would have doubled in bandwidth, an unacceptable option as the video baseband bandwidth was required to be not more than 3 MHz. Color broadcasts started at similarly higher resolutions, first with the US NTSC color system in 1953, which was compatible with the earlier monochrome systems and therefore had the same 525 lines of resolution. European standards did not follow until the 1960s, when the and color systems were added to the monochrome 625 line broadcasts.

The (NHK, the Japan Broadcasting Corporation) began conducting research to 'unlock the fundamental mechanism of video and sound interactions with the five human senses' in 1964, after the Tokyo Olympics. NHK set out to create an HDTV system that ended up scoring much higher in subjective tests than NTSC's previously dubbed 'HDTV'. This new system, NHK Color, created in 1972, included 1125 lines, a 5:3 aspect ratio and 60 Hz refresh rate.

The Society of Motion Picture and Television Engineers (SMPTE), headed by Charles Ginsburg, became the testing and study authority for HDTV technology in the international theater. SMPTE would test HDTV systems from different companies from every conceivable perspective, but the problem of combining the different formats plagued the technology for many years. There were four major HDTV systems tested by SMPTE in the late 1970s, and in 1979 an SMPTE study group released A Study of High Definition Television Systems:. EIA monochrome: 4:3 aspect ratio, 1023 lines, 60 Hz.

NHK color: 5:3 aspect ratio, 1125 lines, 60 Hz. NHK monochrome: 4:3 aspect ratio, 2125 lines, 50 Hz. BBC colour: 8:3 aspect ratio, 1501 lines, 60 Hz Since the formal adoption of 's (DVB) widescreen HDTV transmission modes in the mid to late 2000s; the 525-line (and ) systems, as well as the European 625-line and systems, are now regarded as standard definition television systems. Analog systems. Main article: In the US, residents in the line of sight of television station broadcast antennas can receive free, over the air programming with a television set with an (most sets sold since 2009 have this). This is achieved with a, just as it has been since the 1940s except now the major network signals are broadcast in high definition (ABC, Fox, and Ion Television broadcast at 720p resolution; CBS, My Network TV, NBC, PBS at 1080i; and The CW at either resolution depending on the local affiliate). As their digital signals more efficiently use the broadcast channel, many broadcasters are adding multiple channels to their signals.

Laws about antennas were updated before the change to digital terrestrial broadcasts. These new laws prohibit home owners' associations and city government from banning the installation of antennas. Additionally, TV sets can display HD content without using an external box. They have a built-in and/or a card slot for inserting a. High-definition image sources include, direct broadcast satellite, digital cable, (including GoogleTV, Roku boxes and AppleTV or built into 'Smart Televisions'), video disc (BD), and internet downloads. Sony's has extensive HD compatibility because of its built in disc-based player, so does Microsoft's with the addition of and streaming capabilities.

On November 18, 2012, Nintendo released a next generation high definition gaming platform, The, which includes TV remote control features in addition to IPTV streaming features like Netflix. The HD capabilities of the consoles has influenced some developers to port games from past consoles onto the PS3, Xbox 360 and Wii U, often with remastered or upscaled graphics. Recording and compression.

Main article: HDTV can be recorded to (Digital-VHS or Data-VHS), (analog only), to an HDTV-capable (for example 's high-definition, 's set-top box, 's VIP 622 or VIP 722 high-definition receivers, or 's Series 3 or HD recorders), or an HDTV-ready. Some cable boxes are capable of receiving or recording two or more broadcasts at a time in HDTV format, and HDTV programming, some included in the monthly cable service subscription price, some for an additional fee, can be played back with the cable company's on-demand feature. The massive amount of data storage required to archive uncompressed streams meant that inexpensive uncompressed storage options were not available to the consumer.

In 2008, the Hauppauge 1212 Personal Video Recorder was introduced. This device accepts HD content through component video inputs and stores the content in MPEG-2 format in a.ts file or in a compatible format file on the hard drive or DVD burner of a computer connected to the PVR through a USB 2.0 interface.

More recent systems are able to record a broadcast high definition program in its 'as broadcast' format or transcode to a format more compatible with Blu-ray. Analog tape recorders with bandwidth capable of recording analog HD signals, such as W-VHS recorders, are no longer produced for the consumer market and are both expensive and scarce in the secondary market. In the United States, as part of the FCC's plug and play agreement, cable companies are required to provide customers who rent HD set-top boxes with a set-top box with 'functional' (IEEE 1394) on request. None of the providers have offered this feature on any of their supported boxes, but some companies have. As of July 2004, boxes are not included in the FCC mandate. This content is protected by encryption known as 5C. This encryption can prevent duplication of content or simply limit the number of copies permitted, thus effectively denying most if not all of the content.

See also. References.

Providing You Widescreen High Definition Best Hd Wallpapers For Mac 2017

Advertisement I don’t know about you, but I’m the kind of guy who needs to change things up on a regular basis. If my environment stays the same for too long, I get tired of it. And that’s why I change my desktop wallpaper every week (among other things). Wallpapers are an excellent way to personalize your computer, and for me, I’ve done it so often that finding, tweaking, and creating wallpapers has become like second nature now. It’s really not as difficult as you might expect. Before I share my tips with you, you may want to first go ahead and Did you know that storing files directly on your desktop can harm your productivity? Desktop storage is simple, but it comes with hidden drawbacks you may not know about.

You can do better! What good is a beautiful wallpaper if it’s cluttered up with icons and shortcuts? Once that’s done, keep reading! Step 1: Check Your Screen Settings The worst thing you can do is use a wallpaper with an aspect ratio that differs from the aspect ratio of your screen. The aspect ratio of a rectangle is simply the proportion between width and height.

The most common are 4:3, 16:9, and 16:10. The second worst thing you can do is use a wallpaper with a display resolution that does not match your screen’s display resolution. If it’s too small, it will appear blurry because it has to be stretched out to fit your screen.

If it’s too big, it will appear fine but take up unnecessary disk space. To find your screen resolution in Windows 10:. Right-click the desktop and select Display settings.

Scroll down and click Advanced display settings. Under Resolution, you’ll see your current screen resolution. You should stay on whichever one is marked Recommended, but feel free to change it to any of the other resolutions if you wish. To find your aspect ratio, divide the width over the height. For example, if my resolution is 1920 x 1080 then I would divide 1920 over 1080 to get 1.778, which indicates a 16:9 resolution. Similarly, 1.333 indicates 4:3 and 1.6 indicates 16:10.) Keep these in mind because they are the targets you want when creating wallpaper images.

Step 2: Find an Image to Use A great photograph is one that fully expresses what one feels, in the deepest sense, about what is being photographed. — Ansel Adams There’s no accounting for taste. Your ideal wallpaper may be too distracting for me while my favorite wallpaper might make you cringe — we like what we like and that’s the end. I can’t just hand you a good source image. You have to find one that suits your tastes.

And make sure the image you find is high resolution, by which I mean 1920 x 1080 or higher. Starting with a high resolution is important because you can always compress it down and maintain quality, but you can’t stretch an image larger without losing quality. Where can you find high-resolution images?

Free stock images are your best bet. We’ve compiled a list of Free high-resolution images are hard to come. Wouldn't it be nice if you could get free stock images that are curated for quality and resolution? That you can use. Most of them use Creative Commons is a set of licenses which automatically give you permission to do various things, such as reuse and distribute the content. Let's find out more about it and how to use it., meaning you’re free to do whatever you want with the images. Always check an image’s licensing so you don’t accidentally infringe on copyrights.

Reddit is another great source for images. If you haven’t already, check out the where you can find all kinds of subreddits dedicated to high-res imagery across dozens of topics: Sea, Fire, Space, Cityscapes, Roads, Architecture, Weather, and more. Almost every image is good wallpaper material.

For personal sentiment, shoot your own photos! You don’t have to be a professional to take pleasing shots, and nowadays even smartphones are It might not be a digital SLR, but your smartphone is punching well above its weight when it comes to photography. The next time you go out, leave your old point and shoot at home. One style that’s perfect for a wallpaper is Tired of taking night-time photos that come out dark, empty, and boring? Or you could just follow With 130 million users and counting, the world has never seen such a tsunami of photography aficionados. Is it possible to draw out ten amazing nature photographers who are snapping the beautiful world around us. And Nature and wildlife photography entices all of us.

But we know so little about the creative people behind them. Let's take a look at some of the best wildlife photographers you should follow. But again, keep copyrights in mind and always ask permission when in doubt. But whatever you do, think about how it will look. Lots of contrast might be hard on your eyes, and darker images are usually easier to look at. (You can find inspiration in these sites for.) Also, if your desktop icons are all on one side of the screen, avoid images that may interfere with that.

Step 3: Resize or Crop the Image If the downloaded image’s resolution matches your screen resolution, you can skip this step. Otherwise, you should before continuing (unless you prefer another image editing app). If the source image’s aspect ratio is the same as your screen, then all you need to do is resize. To resize in GIMP:. Open the image file. In the menu, click Image Scale Image.

Under Image Size, make sure the chain icon is connected. If it isn’t, click on it. This makes sure that the aspect ratio will remain the same during the resize. Change the Width to the width of your screen resolution, then hit Enter. The Height should automatically adjust and stay the same aspect ratio.

Click Scale to finish. If the source image has a different aspect ratio than your screen, you’ll need to crop it. Cropping just means cutting out excess bits of the image. Here’s how to do it in GIMP:. Open the image file. Select the Crop tool in the toolbar. In the Tool Options panel, check the box labeled Fixed and then select Aspect Ratio in the drop-down menu.

Right under it, type in your aspect ratio (for example, 16:9). Click-and-drag your mouse on the image to make a selection. Everything within the selection will stay, and everything outside of the selection will be cut away.

You can drag the selection box around if needed. When you’re ready, double-click the selection box to finalize the crop. Resize the image to your screen resolution using the instructions above. Lastly, you can complete the finished image by going to File Export As and saving it as either JPG (for optimal file size) or PNG (for optimal image quality). Now just set the image as your wallpaper. Or Just Download Pre-Made Wallpapers If this is too much work for you, no worries. You can always hop over to one of Your choice of desktop wallpaper says a lot about who you are.

So, if your wallpaper is an expression of who you are, where can you find wallpapers that fit your personality? And download one that appeals to you. Remember to keep your screen resolution in mind, and feel free to filter by aspect ratio if you’re using a relatively small resolution like 1366 x 768. Also note that Windows 10 supports “live wallpapers” (i.e. Instructions for creating those are beyond the scope of this article, and they’re a lot more work, but you can always grab some A live wallpaper can help you relax, improve your mood, or even get you hyped ahead of a big event. We show you the best animated wallpapers you can get on your Windows desktop.

To try them out. What are you using as your current wallpaper? What kinds of wallpapers are your favorite? Let us know in the comments below! Originally written by Saikat Basu on 28th July 2009 Explore more about:.