Τί είναι το Nit για την εικόνα της τηλεόρασης,γιατί η 43 αρα ακριβή Hisense που έχουμε στο κατάστημα εχει 1200 nits !

Οκονομου Κωνσταντίνος
What are nits, and why are they important for your next TV? As TVs get brighter and brighter, manufacturers are using their brightness, often measured in nits, as a marketing tool. Here’s what you need to know. BY GEOFFREY MORRISON APRIL 1, 2018 4:00 AM PDT 5 Sarah Tew/CNET If you've read any TV reviews lately, or anything about modern TV technology, you've likely come across the term "nit." The short version is that it's a colloquial term for a unit of brightness. That description might be enough for you. Lots of nits = lots of brightness, which helps the image look better in a bright room or with HDR TV shows and movies. If you're still reading, I assume this is because you're looking for something a bit more in depth. I've got you covered. Nits galore A "nit" is another way to describe a brightness of 1 candela per square meter (cd/m2). An average candle produces roughly 1 candela. Now you know where the name comes from. Happy birthday. That amount of light, spread over a square meter, is one nit. Or to put it another way, imagine a box, 16-inches (40.8cm) on each side, with a candle in the middle. The total amount of light hitting the interior surface of that box is 1 nit. But let's talk about the stuff that interests us here. A movie theater screen, in your average movie theater, can probably get as bright as about 50 nits. If your TV is a few years old, pre-HDR, it can probably reach between 100 and 400 nits. Plasmas (now defunct) would be on the low side of that, while high-end LCDs on the other side. Modern TVs can be much brighter, with the top-of-the-line HDR TVs putting out over 1,500 nits. In the next few years, we'll likely see even higher light outputs. Sony, at CES 2018, showed a prototype TV capable of 10,000 nits. sony-10000-nit-prototype Sony's stunningly gorgeous 10,000 nit "full-spec" HDR prototype shown at CES 2018. Even in a darkened room, the image wasn't too bright to watch, it was just impressively realistic. Geoffrey Morrison/CNET Here's where we remind you that a manufacturer's claim and a real-world nits number are often not the same. In CNET's TV reviews we measure the light output in nits of every TV for both HDR and standard material, and we've found that some TVs live up to the claim and some do not. And some have other imitations, for example the tendency of some Samsung TVs to vary their light output over time, dropping to half brightness or less after a certain period. Caveat emptor. What about feet? You may have seen mention in TV and projector reviews of "foot-lamberts." This is the Imperial version of nits, so they're directly comparable: 1 nit = 0.29 foot-lamberts. So a TV that puts out 1,000 nits is putting out 291.9ftL. Generally, though, everyone (including CNET reviews) uses nits now. RELATED ON CNET TVs are only getting brighter, but how much light is enough? How quantum dots could challenge OLED for best TV picture TV resolution confusion: 1080p, 2K, UHD, 4K, 8K, and what they all mean LED local dimming explained Lumens? Another measure of light is called lumens, and this… gets complicated. For what CNET deals with, lumens typically only apply to projectors. It tells you how much light energy something is throwing out, but not exactly how "bright" it will appear. That's because you're not looking directly at a projector. If a projector has "2,000 lumens" for example, it's going to appear differently bright whether you use a 50-inch screen or a 150-inch screen. Or to flip it around, a 500 nit phone and a 500 nit TV are going to appear equally bright to your eye. But a 2,000 lumen projector on a 50-inch screen is going to look WAY brighter than a 2,000 lumen projector on a 150-inch screen. So, does that mean two 2,000 lumen projectors will appear equally bright on the same size screen? Nope. That'd be too easy. There's no specific method to measure lumens, so manufacturers can fudge these numbers quite a bit. It's doubtful a 2,000 lumen projector will be dimmer than a 1,000 lumen projector, but take the numbers, any manufacturer-supplied specs really, with a grain of salt. An exception to that is ANSI lumens, which specifies the method of how to measure the light. Those numbers should be largely comparable across projectors. Or to put it simply, a projector is measured in lumens, the image it projects on a screen is measured in nits, just like a TV. Since projector manufacturers don't know what size or gain screen you're going to use, it's a lot easier to say "1,000 lumens" than "300 nits (on a 100-inch, 1.3 gain screen in a dark room with the projector sitting at screen height, unzoomed, in the Bright picture mode...)." Neat nits TV manufacturers have always striven to create bright televisions. The brightest TV is the one that sold, or so the old adage went. Now, in the HDR era, this brightness has another purpose: picture quality. One of the main aspects to HDR performance is creating realistic highlights. The brighter these small areas of the screen are, the better. Imagine, for example, a glint off an aircraft's metallic skin. In real life, this with be significantly brighter than the rest of the scene. On a great HDR TV, it is as well. This isn't to say a 2,000 nit TV is going to always look better than a 1,500 nit TV, but it can be a factor. Brightness (nits) is only one half of the all-important contrast ratio equation; the other is black level. Meanwhile new technologies like quantum dots are pushing overall performance, including brightness, to levels we couldn't have imagined 10 years ago. So there you go, all the nits fit to pick. Got a question for Geoff? First, check out all the other articles he's written on topics like why all HDMI cables are the same, TV resolutions explained, LED LCD vs. OLED and more. Still have a question? Tweet at him @TechWriterGeoff then check out his travel photography on Instagram. He also thinks you should check out his best-selling sci-fi novel and its sequel. Best TVs right now: The past year's best sets, all in one place. Smart home compatibility tool: Find out what smart home platforms work with your existing kit and vice versa. SHARE YOUR VOICE 5COMMENTS TAGS TVs Projectors 4K TVs Samsung Sony CLOSE Discuss: What are nits, and why are they important for your next TV? Be respectful, keep it civil and stay on topic. We delete comments that violate our policy, which we encourage you to read. Discussion threads can be closed at any time at our discretion. Next Article: The best back-to-school laptop deals COMPUTERS LEER EN ESPAÑOL The best back-to-school laptop deals Major discounts on eight great laptops for students. BY JUSTIN JAFFE SEPTEMBER 5, 2019 6:02 AM PDT 16 macbook-air-2018-analisis-11 Óscar Gutiérrez/CNET With Labor Day behind us, we're in the thick of back-to-school season -- and retailers are offering up some of their best deals since Black Friday. This is a great time to pick up a new laptop. Some of our top college laptop picks are discounted right now. Best Buy has the 2018 MacBook Air for $950. You can currently pick up the Microsoft Surface Pro 6 for less than $800, Type Cover included. Best Buy is selling the Razer Blade Stealth -- our top Windows alternative to the MacBook Pro -- for $500 off. And there are good deals to be had on some higher-powered machines from Lenovo, Acer and Asus. Watch this: Back-to-school MacBooks get faster, cheaper 5:15 We've rounded up some of the best deals below. Check them out. Note that CNET may get a share of revenue from the sale of the products featured on this page. SEE ALSO Our favorite back-to-school picks for 2019 11 great gadgets that can smarten up a dumb dorm room Best back-to-school headphones Samsung Chromebook Plus V2: $430 Save $205 Sarah Tew/CNET I'm liking the look of this higher-end configuration of the Plus V2: You get the faster Core m3 processor, 64GB of hard drive space and the 12-inch HD display that can be used in laptop or tablet mode. $430 AT AMAZON Read the Samsung Chromebook Plus V2 review Lenovo IdeaPad 330 (17-inch, Intel Core i7, Nvidia GeForce MX150): $679 Save $300 Sarah Tew/CNET This is a solid Lenovo laptop chock full of higher-end components. For under $700, you get a massive 17.3-inch HD display, an Intel Core i7-8550U CPU and Nvidia GeForce MX150 graphics chip, 16GB of RAM and a huge 1TB hard drive. $679 AT EBAY Read the Lenovo Ideapad 330 preview Microsoft Surface Pro 6 (with Type Cover): $774 Save $226 Sarah Tew/CNET The king of the Windows tablets, heavily discounted. For just under $800, you get a solid array of components -- an Intel Core i5 CPU, 8GB of RAM and 128GB of storage capacity -- plus the Type Cover, which normally costs an additional $89. This is a solid Prime Day-caliber deal that's still in full effect. $774 AT AMAZON Read the Surface Pro 6 review Apple MacBook Air (2018): $950 Save $150 Óscar Gutiérrez/CNET The 2018 version of the MacBook Air is nearly identical to the brand-new one that debuted in July -- except that it doesn't have Apple's True Tone display technology. And you get an Intel Core i5 processor, 8GB of memory and a 128GB SSD that's faster than the one in the newer model. $950 AT BEST BUY Read the MacBook Air (2018) review Acer Predator Helios 300: $1,079 Save $250 Sarah Tew/CNET For less than $1,100, you get a 15.6-inch FHD display, an Intel Core i7-8750H CPU, an Nvidia GeForce GTX 1060 GPU, 16GB of DDR4 RAM and a 256GB SSD. It's a good deal on some entry-level gaming hardware. $1,079 AT AMAZON Read the Acer Predator Helios 300 review Razer Blade Stealth: $1,100 Save $500 Straight up, this laptop is among the best Windows alternatives to a MacBook Pro. Best Buy's $500 discount makes it a certified bargain. Note that the step-up version, with the 512GB SSD, is also on sale for $1,500. $1,100 AT BEST BUY Read the Razer Blade Stealth review Alienware 17: $1,365 Save $335 Sarah Tew/CNET The Alienware 17 is built like a tank and comes equipped with well-designed lighting scheme and controls. This configuration, which includes a newer eighth-gen Intel Core i7-8750H processor, 8GB of DDR4 SDRAM and a 1TB hard drive (plus a 256GB SSD), is powered by Nvidia's GeForce GTX 1060 GPU. $1,365 AT AMAZON Read the Alienware 17 R4 review Asus ROG Zephyrus S: $1,392 Save $500 Sarah Tew/CNET I reviewed the Asus Zephyrus S last year and loved its 15.6-inch HD display and backlit keyboard. And the GeForce GTX 1070 GPU is potent enough to handle just about any contemporary game. At this price, it's an absolute no-brainer for anyone looking for a powerful machine with a super sleek profile. $1,392 AT AMAZON Read the Asus Zephyrus S review Originally posted earlier, updated to verify that sales are still in effect at time of last publication. Best laptops for college students: We've got an affordable laptop for every student. Best live TV streaming services: Ditch your cable company but keep the live channels and DVR.

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