Weligaa ma is weydiisay waxa ay tahay PPI ? Waxaa laga yaabaa inaad maqashay shirkado ka hadlaya shaashadaha DPI sare oo aad rabtay inaad ogaato waxa taasi tahay? Waa maxay sababta qaar ka mid ah soosaarayaasha ay ugu faanaan qalabkooda ugu sarreeya ee leh muraayadaha cufnaanta pixel ee weyn? Maxay PPI aad muhiim ugu tahay, gaar ahaan marka la tixraacayo taleefannada casriga ah? Akhri maqaalkan, oo waxaad ogaan doontaa waxa ay ka dhigan tahay, haddii PPI iyo DPI ay isku mid yihiin iyo haddii cabbirkan uu muhiim yahay marka laga hadlayo shaashadaha oo dhan:

Waa maxay PPI?

PPI waa soo gaabinta laga bilaabo Pixels Per Inch . Waa halbeeg cabbiraadda loo isticmaalo in lagu qiyaaso tirada pixels ee laga helay dusha inch square. Si aad fikrad cad uga hesho waxa ay ka dhigan tahay, qiyaas inj labajibbaaran oo kala qaybsan oo lagu habeeyay unugyo kala duwan. Mid kasta oo unug kasta oo ka mid ah shabaqyadaas waxa uu leeyahay pixel gudaha ah. Tirada unugyada gudaha shabagga, sidoo kale loo yaqaan pixels, ayaa kuu sheegaya PPI .

Caadiyan, qiimaha Pixels Per Inch waxaa loo isticmaalaa in lagu cabbiro cufnaanta pixels ee bandhigyada, sida kormeeraha aad ku haysato kumbuyuutarkaaga ama laptop-kaaga, shaashadda TV-ga, iyo casrigaaga casriga ah.

Si kastaba ha ahaatee, PPI waa erey sidoo kale si dabacsan loo isticmaalo sifaynta cufnaanta pixel ee sawir-qaadayaasha, muraayadaha kamaradaha, ama sawirada si dhijitaal ah loo kaydiyo. Dadka qaarkiis waxay u isticmaalaan PPI xitaa inay kuu sheegaan xallinta ay daabacayaashu ku daabacaan warqad.

PPI iyo DPI ma isku mid baa?

PPI waa nooca gaaban ee Pixels Per Inch, iyo DPI waa nooca la soo gaabiyey ee Dhibcaha halkii Inji^{(Dots Per Inch)} . Caqliga guud^(Common) wuxuu u badan yahay inuu kuu horseedo inaad rumaysato inaysan isku mid ahayn. Adiguna sax baad ahaan lahayd! In kasta oo labada erayba ay tixraacayaan cufnaanta, oo aad si fudud ugu khaldi karto pixels iyo dhibco (malaha sababtoo ah aad bay u yaryar yihiin), PPI iyo DPI waa waxyaabo kala duwan. Halka PPI ay inta badan tixraacdo shaashadaha iyo walxaha dhijitaalka ah, DPI waa erey si sax ah loo isticmaalo marka aad tixraacayso waxyaabaha sida warqad daabacan.

Xallinta iyo tayada warqadda daabacan waxaa si sax ah loogu cabbiraa tirada dhibcaha khad ee xarfo kasta ama sawir kasta. DPI iyo PPI labaduba waxay cabbiraan waxyaabo isku mid ah, laakiin dhibco maaha pixels, iyo pixels ma aha dhibco, markaa DPI la mid ma aha PPI .

Si kastaba ha ahaatee, PPI iyo DPI ayaa inta badan loo isticmaalaa in lagu qeexo wax la mid ah. Sax maaha, laakiin shirkadaha waaweyn sida Google iyo Microsoft iyo warshado badan oo qalabka wax soo saara ayaa inta badan isticmaala ereyadan si is beddel ah, sidaas darteed dadku waxay bilaabeen inay si dabacsan u adeegsadaan.

PPI miyay^{(Does PPI)} muhiim tahay markaad dooranayso TV-gaga, bandhiga kombiyuutarka ama casrigaaga?

Haa, wuu sameeyaa, oo aad bay muhiim u tahay. Markaad tagto iibso talefan cusub, ama muraayada kombayutarka, ama TV, ama nooc kasta oo kale oo qalab ah oo muraayad leh, waxa laga yaabaa inaad isku daydo inaad doorato midka leh cabbirka geesaha ugu weyn. Waa dabiici in aad weynaato marka aad awooddo, sax? Laakiin taasi had iyo jeer maaha doorashada saxda ah oo halkan waa tusaale sababta:

Aynu nidhaahno inaad rabto inaad hesho casriga cusub, oo aad rabto inuu haysto shaashad weyn. Wax u dhexeeya 5.5" iyo 6". Ka dib markaad eegto intarneedka, waxaad go'aansataa inaad jeceshahay Samsung Galaxy S8 iyo Sony Xperia XA1 Ultra . Lacagtu adiga dhib kuguma aha - waxa macno leh si kastaba ha ahaatee waa shaashadda taleefankaaga casriga ah ee soo socda. Samsung Galaxy S8 waxa uu leeyahay shaashad 5.8 inch ah, xallinta 1440 x 2960 pixels iyo cufnaanta pixel 570 PPI . Sony Xperia XA1 Ultra waxay leedahay shaashad 6.0-inch ah, xallinta 1080 x 1920 pixels iyo cufnaanta pixel 367 PPI . Inkasta oo ay labadooduba leeyihiin cabbir isku mid ah, xallinta iyo cufnaanta pixel PPI ee^(PPI)Samsung Galaxy S8 aad ayey uga badan tahay waxa Sony Xperia XA1 Ultra ay bixiso. Taas macnaheedu waa in ay jiraan pixels badan oo badan oo ku faafay dusha jirka oo la mid ah, shaashadda. Ma sawiri karno 570 pixels, ama xitaa 367, sawirka cabbirka inch ah, sababtoo ah ma arki doontid. Laakiin halkan waxaa ah sawir ku saabsan sida cufnaanta PPI ee kala duwan ay u eg yihiin:

Markaa miyaydaan dooran talefanka casriga ah ee leh PPI -ga sare , Samsung Galaxy S8 ?

PPI sare , ama cufnaanta pixel, waxay la macno tahay inaad hesho tafaasiil badan oo dhan wax kasta oo ka muuqda shaashaddaada. Taas oo^(Which) macnaheedu yahay sawiro ka wanaagsan, xarfo wanaagsan, xariiqyo siman, ama si kale haddii loo dhigo, tayada sare. Qof kastaa wuu rabaa taas, sax?

Goorma ayuu PPI noqonayaa mid aad u sarreeya oo uu noqdo mid aan macno lahayn?

Inkasta oo PPI -da sare ay had iyo jeer ka wanaagsan tahay aragti ahaan, ka hor intaadan iibsan wax kasta, waa inaad sidoo kale ogaataa in indhaha bini'aadamka intooda badani aanay awoodin inay ogaadaan wax farqi ah oo PPI ah oo ka sarreeya xad gaar ah.

Laakiin waxa xaddidan ayaa ah marka isha bini'aadamka ay joojiso inay awood u yeelato inay aragto faahfaahin dheeraad ah shaashadda oo cufnaanta pixel ay joojiso inay noqoto mid muhiim ah, waa arrin dood ah. Hadda, cilmi-baarayaasha iyo dadka caadiga ah midkoodna kuma siin karaan jawaab toos ah oo waxay yiraahdaan "cufnaanta pixel waxay noqotaa mid aan macno lahayn ka dib, waxaad dhahdaa, qiimaha 570 PPI ."

Si kastaba ha ahaatee, marka loo eego Aasaaska Sawirka Dijital ah ee Daawada^{(Fundamentals of Digital Imaging in Medicine)} ee Roger Bourne , waxay u muuqataa in lambarka sixirka uu noqon doono 400 PPI haddii aad eegto sawirka laga helay qiyaastii 16 inji ama 40 cm fogaan indhahaaga. Taasi waa sababta oo ah isha bini'aadamku waxay leedahay 400 unug dareemayaal halkii millimitir ee dusha retina. Si kastaba ha noqotee, dadka Sharp jooga waxay u maleynayaan in isha bini'aadamka ay awood u leedahay inay aragto ilaa 1000 PPI^{(the human eye is capable of seeing up to 1000 PPI)} , taas oo aad uga sareysa waxa elektiroonigga ah ee maalmahan.

Eizo waxa kale oo uu leeyahay maqaal aad u fiican, oo loo yaqaan Jahwareer ku saabsan bandhigga HiDPI iyo Retina? - Fahamka cufnaanta pixel ee da'da 4K^{(Confused about HiDPI and Retina display? ― Understanding pixel density in the age of 4K)} , kaas oo aad ka heli karto dhowr jadwal oo xog leh oo muujinaya maxay yihiin xallinta shaashadda iyo cufnaanta pixel ee maanta la isticmaalo. Inta badan qiyamka cufnaanta pixel ee aad arki doonto oo loo isticmaalo bandhigyada casriga ah, ha ahaadeen bandhigyada casriga ah, bandhigyada tablet-ka ama kormeerayaasha kumbuyuutarka, waxaa xisaabiya shirkadaha wax soo saara iyadoo ku xiran masaafada caadiga ah ee isticmaalayaashu ay eegaan shaashadahaas. Tusaale ahaan, taleefanka casriga ah ee cabbirkiisu yahay 5.6 inji waa inuu lahaadaa xallin ugu yaraan 2560 x 1440 pixels iyo cufnaanta pixel ee ku saabsan 525 PPI . Pixelarrimaha cufnaanta, laakiin iyadoon loo eegin waxa ay shirkaduhu suuq geeyaan alaabtooda, ha bilaabin inaad lacag ku bixiso ilaa aad aragto waxa muraayadda qalabkaaga xiga u eg yahay.

Ma raadin doontaa PPI-da ugu sarreysa?

Waxaan xiiseyneynaa: hadda oo aad ogtahay in cufnaanta pixel-ka sare ay ka fiican tahay kan hoose, miyaad tixgelin doontaa marka xigta ee aad iibsaneyso shaashadda TV-ga, kormeeraha kumbuyuutarka ama casriga cusub? Mise waxaad aadi doontaa cabbirka ugu sarreeya iyadoon loo eegin Pixels per Inch ?

Simple questions: What is PPI and does it matter?

Haνe you ever wondered what РPI is? Maybe you've heard companies talking about high DPI screens and wanted to know what that is? Why are some manufacturers bragging about thеir high-end deviсes with huge pixel density screens? Whу does PPI matter so much, especially when referring to smartphones? Read this article, and you'll find out what it means, whеther PРI and DPI are the same and whether this measurement matters when talking aboυt screens of all ѕizes:

What is PPI?

PPI is the acronym from Pixels Per Inch. It is a unit of measure used to quantify the number of pixels found on a square inch surface. To get a clear idea of what it means, imagine a square inch that's divided and organized in a grid of cells. Each and every cell in that grid has a pixel inside. The number of cells inside the grid, also known as pixels, tells you the PPI.

Usually, the Pixels Per Inch value is used to measure the pixel density of displays, such as the monitor you have on your computer or laptop, on your TV screen, and on your smartphone.

However, PPI is a term that's also loosely used for describing the pixel density of scanners, camera screens, or images that are stored digitally. Some people use PPI even for telling you the resolution at which printers print on paper.

Are PPI and DPI the same?

PPI is the short version from Pixels Per Inch, and DPI is the abbreviated version of Dots Per Inch. Common sense will probably lead you to believe that they're not the same. And you'd be right! Although both terms refer to density, and you could easily confuse pixels with dots (probably because they're so tiny), PPI and DPI are different things. While PPI refers mostly to screens and digital elements, DPI is a term that's used correctly when you refer to things like printed paper.

The resolution and the quality of a printed paper are rightly measured by the number of ink dots in any given character or drawing. Both DPI and PPI measure similar things, but dots are not pixels, and pixels are not dots, so DPI is not the same as PPI.

However, PPI and DPI are often used to describe the same thing. It's not correct, but big companies like Google and Microsoft and many hardware manufacturers often use these terms interchangeably, and thus people started to use them loosely too.

Does PPI matter when choosing your TV, computer display or smartphone?

Yes, it does, and it matters quite a lot. When you go buy a new smartphone, or computer monitor, or TV, or any other type of device that has a display, you might be tempted to choose the one that has the largest diagonal size. It's only natural to go big when you can, right? But that's not always the right choice and here's an example why:

Let's say that you want to get a new smartphone, and you want it to have a large screen. Something between 5.5" and 6". After looking around the internet, you decide that you like Samsung Galaxy S8 and Sony Xperia XA1 Ultra. Money doesn't matter to you - what does matter however is the screen of your next smartphone. The Samsung Galaxy S8 has a 5.8-inch display, a resolution of 1440 x 2960 pixels and a pixel density of 570 PPI. The Sony Xperia XA1 Ultra has a 6.0-inch screen, a resolution of 1080 x 1920 pixels and a pixel density of 367 PPI. Although they both have a similar screen size, the resolution and the PPI pixel density of the Samsung Galaxy S8 are much higher than what the Sony Xperia XA1 Ultra has to offer. That means that there are a lot more pixels spread across a similar physical surface, the screen. We can't draw 570 pixels, or even 367, in an image the size of an inch, because you wouldn't see them. But here's an illustration of what different PPI pixel densities look like:

So wouldn't you choose the smartphone with the higher PPI, the Samsung Galaxy S8?

A higher PPI, or pixel density, means that you get a whole lot more detail for anything that's displayed on your screen. Which means better images, better fonts, smoother lines, or in other words, higher quality. Everybody wants that, right?

When does the PPI become so high that it becomes meaningless?

Although higher PPI is always theoretically better, before making any purchase, you should also know that the eyes of most humans are probably not able to perceive any differences in a PPI that's higher than a certain limit.

But what that limit is when the human eye stops being able to see more details on a screen and the pixel density stops being important, is a matter of debate. For now, neither researchers nor ordinary people can give you a straight answer and say that "pixel density becomes meaningless after, say, a value of 570 PPI."

However, according to the Fundamentals of Digital Imaging in Medicine by Roger Bourne, it seems that the magic number would be 400 PPI if you look at an image found at roughly 16 inches or 40 cm distance from your eyes. That's because the human eye has 400 sensor cells per millimeter of retina surface. However, people at Sharp think that the human eye is capable of seeing up to 1000 PPI, which is considerably higher than what electronics offer these days.

Eizo also has an excellent article, called Confused about HiDPI and Retina display? ― Understanding pixel density in the age of 4K, in which you can find a few tables with data that show what are the screen resolutions and pixel densities used today. Most of the pixel density values you'll see used on modern displays, be they smartphone displays, tablet displays or computer monitors, are calculated by the manufacturing companies depending on the common distances users look at those screens. For instance, a smartphone with a screen size of 5.6 inches should have a resolution of at least 2560 x 1440 pixels and a pixel density of about 525 PPI. Pixel density matters, but regardless of what companies market their products, don't start spending money until you see what the screen of your next device looks.

Will you look for the highest PPI?

We're curious: now that you know that a higher pixel density is better than a lower one, will you take it into consideration the next time you buy a TV screen, a computer monitor or a new smartphone? Or will you go for the highest size no matter its Pixels Per Inch?

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