What is the screen pixel density (PPI) of a smartphone? Why pixel density is not as important as you might think

To understand such important and basic understandings of printing as ppi and dpi, it is necessary to understand the basics of computer graphics first.

To begin with, it is important to know that ppi and dpi are far from the same and are not exactly the same.

Well, ppi, of course, stands for “pixels per inch,” which means “pixels per inch.” Since the metric measurement system is adopted in the Russian Federation, it is hard to guess that 1 inch is equal to 2.54 cm (although it is rounded, in reality it is 2.5399931 cm). Therefore, for us, a photograph of 10×15 cm with such separate dimensions as 300ppi means approximately the same: a photograph with side dimensions of 10×15 cm in which 2.54 cm is 300px. What is more than 118px by 1cm (this is difficult to calculate with a division of 300 by 2.54 - the result may not be complete, since there is not half a pixel).

The size of this photograph can also be specified in pixels, as is often the case with computer graphics. Multiply the physical size of the photo by the number of pixels that fit in one centimeter 10cmx118px=1180px and 15cmx118px=1770px and the size of the photo can be determined in pixels 1180x17 70px. As a rule, people who have little understanding of computer graphics begin to understand the beauty of a photograph based on its pixel dimensions, which is misleading. Because the image is 100x150cm with a separate 30ppi size, the pixel size is also 1180x1770px. Whenever you look at such an image, it will be impossible to see it from less than 20 meters away, as usual, otherwise the images will cease to be sensible, and will turn into a set of different-colored square pixels.

For a file assigned to a friend, the physical size of the image is important along with its separate nature. Therefore, it is much more competent to indicate the physical dimensions of the file in cm and its separate size in ppi (if the abbreviation would be formally adopted from the definitions of cm, then the following should be used, especially).

Pixel size is an abstract concept that can only be understood in the virtual space of computer graphics. For greater clarity, let's take our 10x15px image at 300ppi and reduce it to 30ppi. Now in one cm there is not 118px, but only 11px, although the image itself has lost the same dimensions.

We are talking about those whose pixel size has changed to a centimeter. So now it is formed from great elements beyond the size that are considered as graphics. Apparently, the smaller the pixels, the more of them are per 1 centimeter, which means the image will be more detailed.

There is minimal separation between images for display on a computer monitor and minimal separation between images. In all cases, the minimum value of 72ppi for a monitor is based on the same English inches, which consists of 12 lines, which, in its turn, consists of 72 points. So it’s different, but in printing (infection is mainly used only in the offset - other newspapers, magazines) there is such a value as lpi (Lines per inch - lines per inch), which in the basic mortal sense is more than enough And I mean to understand the rogue ppi, lpi and dpi, as we are now careful about. The name “line” has a mental character and is essentially an analogue of a point or pixel. What is already becoming confused. Therefore, let’s not forget about the term lpi, fragments of wines are rarely used today in digital printing and until the end of a reasonable circle of people who understand the processes of the so-called de-registration ( The main process of learning how to deal with each other is more than 50% successful with each other). Let's just talk about ppi and dpi.

At the same time, as before, we talk about ppi - the separate size of the digital image: of course, the minimum acceptable size for creating graphics on the monitor is 72ppi. All monitors are 72ppi separately, so if you bring your nose close to the monitor, you can completely separate the pixels of the image. Whatever the size of the monitor itself - 15 inches or 17. It will always be 72px (then screens with a higher level of separation have begun to appear - HD, FHD, UHD ... This leads to the fact that now There is no uniform standard for monitor resolution, and however, images on different monitors will appear different in size, regardless of which case everything is oriented at 72px).

What happens if the image is larger than 72px, for example 350ppi? You will still receive images from a separate monitor at 72ppi. You will understand that the images have a separate appearance, you can only look at them when you change the scale. A larger image scale (closer to it) will reveal new details that were previously invisible. When the images with a separate size of 72px are close, the pixels will be clearly visible and the images will be divided into different colored squares.

You can often see such a phenomenon if you move the image from 72ppi (for example, taken from the Internet) to 300ppi and ask it to be transferred to a large format. It’s worth mentioning the seemingly unreasonable term “allowed” as such. It’s important to emphasize the separateness of the image, since 72ppi is not much. In order to greatly increase its size and with a greater displacement of the pixel structure, the images will appear to be greatly expanded. Detail and detail are not possible.

Each time a photograph is taken, the minimum size required is 150ppi. It is expected that the photographs can be viewed in person. Separate production of 150ppi with an hour of another image at a scale of 1:1 does not show the pixel structure. However, there are often some recommendations that the more separate the image that is applied to each other, the more clear it will be. Tse gliboke omanu. The high separateness of the image adds up to an hour of computer processing of the image in front of each other. 150ppi is completely enough for each other. A high resolution of 300 or more ppi, which is typical for a photograph (for example, taken on a wide-format camera), is primarily necessary to increase the scale. For example, a 10x15cm photograph with a separate section of 300ppi can be doubled up to 20x30cm without wasting any juice, and almost up to 40x75cm for another with a pleasant clarity for the mind, but the photograph is not take a close look. As a result, the clarity of the image remains due to the coarse adjustment of separate parts. In addition to photography, you need to adjust the camera. If you just need digital images, you need to adjust the new file in the program. If you take a photo at 300ppi, reduce it to 72ppi, and then rotate it by 300ppi, but you won't lose much detail.

Today, there are a number of additions that help increase image sharpness with a low contrast ratio. Zokrema can be created using Photoshop or using other advanced programs in the field PhotoZoom Pro. The results can be seen as really disappointing, but in some case there will be a slight increase in sharpness, which, in fact, does not reflect the detail in the image, and with the help of the smearing of the pixels, such an illusion can be created. However, for the most part, the task itself will arise.

Now is the time to take a look at the food - what is dpi?

dpi - deciphered as “dots per inch” and translated as “dots per inch”. At first glance, the concepts ppi and dpi are identical, especially if you remember that the term pixel denotes the minimum point of computer graphics, because, due to the characteristics of virtual light, it has the shape of a square. It seems that it is an insult to talk about the same thing - speckles per inch. But in truth, these concepts are not related to each other. To better understand the difference between them, remember that ppi as a term from computer graphics is a concept of virtual world, and dpi is a term from printing, which means real world. To put it more adequately, ppi is the separate property of the digital image itself, and dpi is the separate property of the other device. And although printing is impossible without graphics, these terms are in no way related to each other.

When you insert a file into another program (usually just a printer driver), the file goes through the ripping procedure. And in its essence it is similar to pixel digital graphics. A matrix (grid) is superimposed on the image. What is relevant here is the term lpi, but we won’t dwell on it, because for us it has no meaning, since anyone can read it as a bad thing. Then the same dpi comes into play, which characterizes the number of dots that are applied to the paper to highlight one raster. In this case, it is no longer important what brought the image itself to ppi - it doesn’t fit into dpi at all. dpi can be compared with the artistic style of pointalism in painting, if the image is formed from different color dots. The smaller the point is, the more it will fit by 1 inch.

The more dots you can fit in 1 inch, the more important the punch will be.

If, for example, you wrap 1440dpi images with 40ppi in a 1:1 scale from a separate building, then you see very clearly labeled images with highly pixelated pixels, which will be visible to the naked eye. rise 1 m. You can, however, combine high-quality ppi images with separate 360dpi images - the text will be blurred and graininess will be visible.

The term dpi is not the only term that characterizes the brightness of the batter. What is also important is the size of the drop that is applied, its shape (either the correct or bright finish), etc. At a low separation distance (360 dpi), the thickness of the droplets will be lower and their size will be larger compared to the separation ratio at 1440 dpi. This is important in terms of detail, precision and fine lines, as well as the richness of colors. A greater number of separate buildings is indicated per hour - a greater number of passages is required. In wide-format and inter-direction, the allowed value is specified by both equal and unequal values. For example, 360×360dpi, 360×540dpi, 540×540dpi, 540×720dpi, 540×1080, 720×720, 720×1080 etc. Why is this so, I admit, I don’t understand it myself. But as a rule, everyone gives values ​​​​beyond the first value, and this is why there are 4 main permissions: 360dpi, 540dpi, 720dpi, 1440dpi.

Today, you can often work in wide-format offices to print images with a separate number indicated in dpi. This is fundamentally wrong and one can attest to the considerable incompetence of the printers who work there. An analogy is also often drawn between the separate nature of an image and the separate nature of a hand, which also speaks of an apparently unreasonable subject. The opposite extreme is if the image has a high degree of separation and the deputy agrees with the same high level of permission. However, there is a sense that this image is in a low-separate format, so it will not appear on the display box, since the image, for example, is a simple text on a colored background, which at a minimum resolution will be and so on.

Highly separate production is relevant for non-human images (photos, babies, etc.). Deputy).

That’s where I’ll wrap up and wish you success with everyone who is so important to understand computer graphics and printing, like dpi and ppi.

08/08/13- Vlad Rachkov

Perhaps you willtsikavi upcoming pages:

The abbreviation PPI stands for Pixel Per Inch, or pixel per inch. This value shows how many pixels are located in one square inch of the actual size of the monitor. The development of the number of pixels is based on the standard formulas of the squamous rectum or the rectcutaneous tricucutine, which is what we learned at school. The larger the value, the greater the separation of the monitor.

What does pixel density ppi mean?

The pixel density ppi determines the clarity and vibrancy of the image displayed on the screen. With a high number of pixels, the pixels will be even smaller, so as not to mark a lot of squares and create the illusion of a smooth transition between the objects that are displayed on the screen.

IMPORTANT! The very brightness of the image is also important - since a picture measuring 20x20 pixels depicts a forest area, then regardless of the strength of the monitor, the picture will be “grainy”.

This characteristic is especially important for those who work with images or videos on a computer or tablet. Well, of course, for fans of computer games with high video luminance settings, a large screen size will be even more suitable.

If we are talking about mobile devices (phones, smartphones, tablets, etc.), then a very high ppi for them will not be so much brown as it will be cheap. Displaying a clear image with a large number of pixels on the screen is harmful to the battery during an hour of operation. Then devices with a high PPI cannot go for a long hour without recharging.

How to regulate?

The size of the display on the PC screen is not difficult to adjust. This may be necessary if you add a new monitor, or perhaps want to change the image displayed on the screen to save RAM and processor power. The required sequence of actions is:

• Press the right button on the mouse in an empty place on the desktop and select “Separate screen size”. A menu will appear where you can select:
• The monitor (or just another) where the PC system is displayed.
• Separation in pixels (there are a lot of options here, one of the values ​​​​as recommendations) that is limited by the maximum screen size.
• Orientation (image format) with many options. As a rule, behind the mind there is a handy tool for dealing with this permission.

On mobile devices, screen controls can be adjusted in the “Adjustments” section. But not all phones give their rulers such control over themselves.

This animated video covers most of the topics in the article, but if it goes into more pedantic detail, be sure to read this entire post.

Pixel density refers to the number of pixels that can fit within a given physical size (per inch). On the first Mac, there were 72 pixels per inch - the number might seem large, but in reality there were large pixels, no matter what graphics are suitable for.

Screen technologies have come a long way since then, and even the most basic computer screens can range in size between 115 and 160 pixels per inch (ppi - pixel per inch). A new chapter in this story emerged in 2010, when Apple introduced the iPhone with a Retina screen - a super-clear screen with a high number of pixels per inch. As a result of this release, the graphics became clearer, even though they had been messed up.

Do you care about the difference in the end of the Mail envelope, as well as the legibility of the text?

In order to maintain the same physical size for the user interface, the pixel dimensions have been increased. The button, which previously took up 44px, now began to take up 88px. For consistency between different devices, designers must release graphics (on the icon base) in “1x” and in the new “2x” format. But there’s another problem here: you can’t anymore say: “Hey, this button is 44 pixels high,” because it’s also 88 pixels on another device. Previously, there was not a single world independent of the pixel. The solutions became “points”, or “pt”. 1 point corresponds to 1 pixel on screens up to the retina generation and 2 pixels on retina screens at 2x. Krakki can say: “Hey, this button is 44 points high,” and then any device can adapt this size to its pixel density ratio... like 1x or 2x. Or 3x at a glance for the iPhone 6 Plus.

PT and DP

Of course, this is not only relevant for Apple desktops; today the operating system, both desktop and mobile versions, supports screens with high ppi/dpi. Google came up with this idea your own version for Android, independent of pixels. That one is not called a “dot”, it’s called a “DIP” - a pixel that does not lie in the thicket, shortened to “dp”. These are not equivalent points in iOS, but the idea is similar. These are universal units that can be converted into pixels using an additional scale multiplier (2x, 3x, etc.).

It is possible to tell you the physical size of the point. In fact, UI designers don’t care much, since we don’t have any control over the hardware features of the screens of various devices. Designers simply need to know what pixel densities are selected for their devices, and how to prepare designs for 1x, 2x, 3x and other required factors. If you really care, know that Apple does not maintain constant conversion between inches and dots. Otherwise, there seems to be no uniform pixel density to set 1 point for a specific device (see the “Scaling” section below). On iOS, the point varies from 132 pixels per inch to 163 pixels per inch. On Android DIP will always be the same as 160 ppi.

Controls chaos

Now get ready to face reality. In the early days of the development of mobile devices with a high level of separation, the pixel density was simply 1x or 2x. But now everything is completely out of the bag - there is a lot of pixelated details that can support the design. Android has a wonderful butt: at the time of writing, the planting of slaughterhouses supports six different pixel densities. This means that the icon, which is the same size on all screens, will appear in 6 different variations. For Apple, two or three different output codes are relevant.

Vector design. 1x design.

And a couple of practical lessons that you can learn from everything. For starters, you have to create designs with vectors. This allows our interfaces, icons and other graphics to scale to whatever size they require.

Another lesson: . In other words, create a design, vikoryst points for all edits, then scale at larger pixel capacities when exporting... instead of designing at the end pixels of individual devices (2x, 3x, etc.) and cause a lot of problems during export. Scaling 2x graphics at 150% to generate a 3x version results in the appearance of blurred contours, which is not the best option. And the graphics scaling axis 1x at 200% and 300% allows you to preserve visual clarity.

Layouts for standard iPhone sizes are supposed to be 375×667, not 750×1334, which is precisely what allowed them to be displayed. Most design tools don't recognize specks as pixels (Flinto is part of this trend), so designers can pretend that specks are pixels and then just export Weekends in 2- and 3-fold sizes.

Pretend until you become the truth!

Here it’s already a little more complicated, but it’s still hard to guess: sometimes the device is breached. It looks like their coefficient of conversion of pixels at a point is one, for example, 3x, but in reality it is 2.61x, and the output itself is scaled at 3x just for clarity. How to get iPhone Plus now and start working. It compresses the interface from 1242x2208 to a screen resolution of 1080x1920 (the phone's graphics chip implements real-time scaling).

Create a design for iPhone Plus, as if it were really 3x. The phone itself scales in 87%.

So, since the graphics change only a little (87%), the result, as before, looks good - a 1px line on the screen with a size of 3x still looks incredibly clear. And there is a chance, although I do not have any insider information, that in the future Apple will introduce a new 3x iPhone Plus, since the required hardware capabilities may be available for the product that is released in such majestic numbers. The current version of the iPhone Plus is just waiting until it becomes possible.

(Bruce Wong wrote about the iPhone 6 Plus screen).

Is this approach to non-integer scaling acceptable? Everything is verified practically. What is the most significant result from such scaling? Many devices on Android also go up to scale to accommodate a more standard pixel-to-point ratio, but, unfortunately, it’s not very clear to work out from them. The scaling of this plan is not necessary, because everything you want to be clear and pixel-perfect on one scale will be scaled through interpolation (for example, a line of 1px is 1.15 pixels). Although you are not as fanatical about perfect pixels as I am, I have no sense in realizing that design elements need to be pixel perfect so that they look clear as intended.
Unfortunately, in the world, as the density of pixels reaches up to 4x and higher, the spread, the response to non-integer scaling, is becoming much less catchable, so I predict that device developers will become increasingly victorious as time goes on. y approach. We can only be sure that the shortcomings in productivity are detrimental to them!

Tailored to scale with your eyes

Let's take a look at the power of pixels and the power: is the button supposed to be the same physical size on different devices? Of course, we just use the button as a butt, otherwise we could look at the icon, the text, and the toolbar. What elements are the same size on all devices? Please lay down:

• Type of accuracy introduction method(Sensor or cursor)
• View physical dimensions screen
• View get up to the screen

The remaining two factors go shoulder to shoulder; Moreover, the tablet has a large screen aligned with the phone, and we keep it in front of us. And then there is a laptop, a desktop computer, a TV... which grows at the same time due to the size of the screen.

The button on your TV screen will be the size of your phone - which is what it is for such a stand.

The axis is less dramatic and even more truthful: the icons of add-ons on the tablet will be larger than the same icons on the phone, and this is implemented in two ways: by choosing smaller pixel density or by changing the size of the window pok (totally point size).

Low pixel density

Larger screens, such as those displayed on the stand, result in lower pixel density. TB may have reached 40 pixels per inch! For an initial glance, this is entirely acceptable. The retina screen on the iPad is approximately 264ppi, while the retina screen on the iPhone is 326ppi. Since the pixels on the iPad are larger (the screen is smaller), the entire interface becomes slightly larger. This is explained by the additional display between the camera and the iPad screen.

Massacres of dimensions

However, as time goes by, the low density of pixels is not enough... in addition to the design elements, there are even more to blame. What happened with the icons on the iPad. On the iPhone there are 60x60 pixels, but the larger screen of the iPad gives more space, so it is more practical for icons sized 76x76.

Changing sizes under different arrangements provides work to designers. This is one of many scenarios when Apple devices reach larger sizes than Android! Fortunately, this is not a typical option for additional icons.

Sanitary check?

We had a good talk about the endless items that we would have to deal with. Fortunately, the design of interfaces is limited to only a few, not long-term ones (such as pt and dp). Everything comes together with program icons, and there are templates to help. Ax list of resources on this topic:

Important resources

Google Device Metrics: A comprehensive list of specifications for all types of devices (Android, iOS, Mac, Windows, etc.). Find out the size of the screen, the density of pixels and move closer to which screen is visible to the eyes of the buyer. ScreenSiz.es is a similar resource.

: These design templates (available for all major design editors) are as basic as a practical sense, and for updating other specifications for Android, iOS, macOS, tvOS, watchOS, Windows, Windows Phone, etc.

: A detailed guide by Sebastian Gabriel that covers even more details and practical tips for Android and iOS designers

More pixel art resources for designers.

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10.09.2012

Apple has never been one of the trends. She has always created trends, and buyers and competitors followed her. One significant trend, in my opinion, has become the value of ppi (Pixel Per Inch) - the number of dots per inch of the display. An indicator that informs about the clarity of the image turns into a mania.

The number of pixels per inch is a very important indicator of how clear the images on the display will be. The higher the value, the less noticeable the pixels will be, and the less noticeable the marks will be on the thin lines of the image. In absolute terms, the more dots per inch, the better. If you want to immediately increase the density of pixels by changing their size, you won’t be able to achieve it - technological interchange, but they are still far away. Completely different nutrition – why do we need high ppi displays?

Before we start working and assess the prospects, let’s go back to the past and marvel at the power of pixels on the small displays of the past. Even so, no one has lost respect for this parameter, and it is equally important.
We will display the displays from the ELT, and finally from the first RK. The typical size of the first models is 15 inches, and the dimensions are 1024 by 768. The thickness will be approximately 85 dots per inch. Then 17 and 19 inch models with separate dimensions of 1280 by 1024 appeared, their ppi increased to 96 and 86 points. The rare 22-inch panels of that time were pleased with the separate size of 1600 by 1200 and the thickness of 91 pixels per inch.

As you can see, all the diagonals are close to the thickness that was considered sufficient. At the same time, I think no one will disagree that the pixels in such displays are visible, and the “drabs” in the fonts are even more noticeable. But there was no one to complain about, except for video card retailers, which, in the fight against bitter slags, over the course of many years, crushed and painted smoothing technologies, which made it possible to disguise this effect.

Today's home monitors have slightly higher pixel density - and all the modes are Full HD. For example, a 21.5-inch monitor with a separate 1920 by 1080 resolution is 102 ppi. And the display of an ASUS laptop with a diagonal of 11.1 inches and a split size of 1366 by 768 is characterized by a thickness of 141 pixels per inch. There are fewer solutions available at a reasonable price for a number of monitors for computers and laptops with a higher pixel density, which is more than you can afford.

All household solutions should be kept within the range of 100 to 140 ppi. On television the situation is even worse. For example, the pixel density of a 32-inch TV with a separate Full HD unit is 69 pixels per inch, and for a 40-inch TV with the same separate part it is only 55 pixels. And it’s scary to talk about great diagonals. For example, a 55-inch panel will have a thickness of 40 ppi.

Then Apple phones and tablets became leaders in pixel density. The first iPhone, as well as its competitors, are not found in today's world, having a diagonal of 3.5 inches with a separate area of ​​320 by 480 pixels, and as a result of the density in 165 dpi. A little later, without much noise, the first smartphone Sony Ericsson Xperia X1 appeared, which has a 3-inch display with a split size of 480 by 800 pixels, and a similar power of 311 ppi. However, Sony could not correctly “present” such high clarity to the buyer, but Apple respected the idea, took notice, and released the iPhone 4 with a high-definition display, which is characterized by a separate size of 640 by 960 with a diagonal і 3.5 inches. 330 pixels per inch of this phone model, under the clear marketing name Retina Display, has won the love of buyers. As a result of this, the ppi values ​​began to appear for everyone. Apple itself has successfully adopted the new generation of iPad under Retina, with a separate display size of 2048 by 1536 with a diagonal of 9.7 inches. Its ppi value is the same as 264 specks per inch, which is at least less than the current generation iPhone, twice as much as the iPad 2, and certainly less than most of its competitors’ displays. In these sizes, the diagonals are small and the separate building area is no more than 1280 by 800.

However, to the credit of their competitors, they quickly had to stand up, significantly increasing the display capabilities of their devices. Sokrem, Samsung Galaxy Nexus can boast of a separate 1280 by 720 size of its 4.65-inch display, the pixel density of which is 316 ppi. And the display of the ASUS Transformer Pad Infinity tablet has a split size of 1920 by 1200 with a diagonal of 10.1 inches, which gives 224 ppi. Whatever it is, the stink won't bother you.

A massive accumulation of stronger pixels and advanced displays with higher PPI values ​​has accumulated in almost all manufacturers. This is not a matter of improving the characteristics of the robot, but of improving it. LG announces a 5-inch display with Full HD separate part, and ppi equal to 440 pixels. Toshiba offers a 6.1-inch diagonal display with 2560 by 1600 pixels, which translates to a resolution of 495 pixels per inch. Well, the leader is still the Japan Display consortium, which recently announced a 2.3-inch display with a separate 1280 by 800 pixels. Its thickness is the same as 651 ppi. Naughty! Why do you need screens with such a high pixel density?

On one side - the thickness of the display definitely won’t melt - you don’t seal the porridge with butter. On the other hand, the great potential of small diagonals is limited. The main thing to remember is the importance of increasing importance on graphic cards. For desktop computers this is not too critical - video cards with high energy consumption are the norm in this market. This advancement allows you to follow the important regime for smoothing, and the fragments of the “drabines” with which you can fight to become practically unnoticeable. And the axis for mobile devices means an increase in the number of pixels that causes the greatest impact after an hour of autonomous work. Not only does the video card work hard to render such images, which requires significant energy consumption, but the display itself becomes more energy-efficient due to the increased number of pixels. So here it is necessary to achieve parity between the retailer’s expectations and capabilities.

But on the right there is not only one thing - we need to complicate the production and production of more expensive products, since the density of pixels is simply not needed in such devices. For example, a TV with a diagonal of 32 inches installed at a distance of more than three meters does not allow one to see the difference in image clarity between HD and FullHD, with which the density is Excellence in them varies markedly - 49 and 69 ppi, obviously. The reason is that from such a distance we cannot see nearby points - our eye simply physically cannot separate them. How can we create a TV of the same diagonal with separate 4Kx2K production? With a split size of 3840 by 2160, we have a density of 138 ppi, which is on par with current displays for laptops and computers. Working with such a monitor at a distance of 70-100 centimeters will be very difficult, but with such a TV stand no one will be surprised! And people, if you sit three meters away from the annex, you won’t be able to tell the difference between a 4Kx2K and FullHD TV.

The reason for this is simple - increasing the number of pixels per inch will not improve the lens responsiveness of the displays. There is an important balance here – balance the view/pixel density. The dot can be taken to be the same as that adopted by Drukarskiy authorities – 300 dots per inch. This thickness allows us not to notice pixelation in magazine photos. However, when the powder is applied to a papier, it spreads, which interferes with the flavor. The optimal pixel density for Varto displays is 330 dpi. And this is due to the fact that you use the devices on the same platform as a newspaper or magazine. Here it is important to note that we are not talking about the minimally necessary permissions and density, but rather about what is needed to capture the ideal image, similar in clarity to the same photograph. yu, over-armed in a glossy magazine, or the images on the screen of the remaining iPhone.

So, 330 pixels per inch is optimal for smartphones, tablets, and e-readers. This is taken as a point of view - as you look at it - 50 centimeters and a width of 330 pixels per inch. With this approach, the optimal split size for a 10.1-inch tablet would be 2800 by 1800 pixels. As you know, the iPad is still a little short. However, the same solution has already been adopted for smartphones – iPhone 4 and 4S, their resolution is 330 pixels per inch.

Monitors and televisions no longer require such strength, since they are viewed from a larger distance. After difficult calculations, the optimal result for home monitors is determined to be on average at a distance of one meter. Physicians note that with a sub-surface view, twice as less thickness is required - the optimal ppi for them is 165 pixels per inch. Then a separate 4Kx2K image (which is 3840 by 2160 pixels) will be optimal for 27-inch monitors. Nowadays, FullHD looks optimal only on 13.3-inch displays. Well, a separate building of 2800 by 1800 pixels will be suitable for 20-inch monitors.

If there are no TVs, then it’s important to ensure that their viewing is carried out from a distance of 2.5 meters - that’s five times more than with smartphones and tablets, as a result - the thickness of the Xeliv there can be five times lower, to preserve the same clarity image Then these devices should be completely machined to a thickness of 66 dots per inch. Now we can determine the ideal relationship between the tolerances and diagonals. 1366 by 768 pixels will look decent on 23-inch displays. Today FullHD offers crystal clear clarity on 32-inch TVs. The same clarity, even with separate 4Kx2K output, can already be achieved on displays with a diagonal of up to 65 inches!

Zmist:

Theoretical side and developments

The concept stands for pixels per inch, which means the number of pixels per inch. It looks the same as pi-pi-ay.

Vaughn literally means how many pixels there are in one inch of the image we see on a tablet or other technology.

This concept is also called a unit in a separate world. The development of this value is achieved using two simple formulas:
de:

• dp- Diagonal extension;
• di- Diagonal size, inches;
• Wp- Width;
• HP- Height.

Another formula is intended for the development of diagonal divisions and is based on a version of the famous Pythagorean theorem.

Small 1. Width, height and diagonal size on the monitor

To show how all these formulas work, let us take for example a monitor with a diagonal of 20 inches and a separate size 1280x720 (HD).

Thus, Wp is approximately 1280, Hp – 720, and Di – 20. The obviousness of these data can be explained pi-pi-ay. Let's start with formula (2).

And now let’s summarize the data for formula (2).

Note: We actually took 73.4 pixels, but there are not a whole number of pixels we can’t, only the whole value value is calculated.

To understand how many centimeters are greater than the basic value for our size, you need to divide the resulting number by 2.54 (there are several centimeters in one inch).

Thus, our application has 73/2.54 = 28 pixels. at centimeter.

The butt has 73, and 25.4/73=0.3. Then the size of the skin pixel is still 03x03 mm.

What is good or what is bad?

Let's figure it out together.

Chi is important qia quantity

Pi-pi-ay, going beyond all that has been said, contributes to the clarity of the image as the picture is captured on your screen.

The larger the size of the display, the clearer the image is captured by the painter.

In fact, the greater the value, the fewer the “squares” of most people.

So that the skin pixel will be small, not large, and not allow everyone to lose their respect. The exact value of the characteristics can be obtained from baby 2

Small 2. The difference between shows is less and more

Of course, no one wants a mother in their picture like the one shown by Evil.

Therefore, when choosing such a technique, it is important to pay attention to this characteristic.

This is especially true if you buy on the Internet and do not have the opportunity to personally evaluate the picture and see how clear it is.

It’s easy to know the characteristics of that same smartphone. Click here to go to the “Display” section. The butt can be adjusted to the little one 3.

Small 3. Indication of the characteristics of the smartphone

Important! On the Internet you can often find information about those that are more important, for example, the diagonal and because of these characteristics can play an important role in the choice. This is not the case at all. Just as we could have crossed over things, all these concepts are inextricably linked with each other.

Pros and cons

Number of pixels. per inch has a positive impact on the clarity of the picture, and consequently, its brightness.

Koristuvachev will be much more impressed by images with a larger display.

On baby No. 2, the photo of evil is 30 ppi, and the photo on the right is 300. Below is another butt.

Ale has some disadvantages. Zokrema talks about the autonomy of the device.

Everything is easy to do - if your image reader, smartphone, tablet or other device with a screen cannot be used for long without recharging.

You can make a simple rule: the more pi-pi-ay, then less than an hour of autonomous work.

Of course, for a PC this is not a problem, since the monitor there is always plugged in to the socket, but the axis for other phones can become a big problem.

Therefore, when choosing a device, be sure to respect not only a few pixels. an inch, and another!

In this manner, we smoothly moved on to those choices.

About selecting displays

There are a number of rules that will help you select the display correctly according to the pixel alignment, which will sound like an imminent sound:

1 Be sure to check the type of display in your language. The priority is AMOLED, or better yet SuperAMOLED or OLED. Such devices will be the best in the future, no matter what.

Let’s say we came to the store and, for example, there were two separate machines – and. Their price is practically the same, the other device is, by the way, worse.

The characteristics indicate that Xiaomi has 400 ppi (I hesitate to write 400.53, but, as we have said before, there is no number of pix. But we can’t).

Samsung has 267 PPI and a separate display, obviously, less (1280x720 versus 1920x1080). However, the diagonal is 5.5 inches.

Alas, the picture is clear on itself. And all through the proprietary technology SuperAMOLED+. You can change into this yourself, in order to increase respect for the little ones 5.

2 Try to find the ability to be especially amazed at all the words you have taken. You can first look through their options on the Internet, and then go to an electronics store and see how they really display pictures. The special look in this guy is simply irreplaceable.

3 Put your money back on the battery. Speaking of smartphones, to ensure long-term operation of the device with clear images (great display of PPI and/or advanced technology), the battery capacity should be around 3000 mAg.

For tablets, this is even more important, since their diagonal is larger,

4 Remember: the smaller the diagonal and the higher the density of pixels (the number of pixels per inch), the clearer the image. It’s not good to deceive yourself - you won’t be able to get even a clear picture with a large display and small values. Here it is important to seek the golden mean.

5 It is important to vrahovuvati pokrittya. So matte screens will show less clarity and intensity of the image, but will be more carefully placed in front of your eyes.

And the axis of glossy displays is negatively aligned with the star, and then the images on them will be much more beautiful. Given the value of ppi, they may, however, be the same.

This is mostly relevant. If you work at the computer all day long, or better yet, opt for the matte version.

All this allows you to choose the most suitable display for yourself.

Pouches

ppi or pi-pi-ay – this is the thickness of pixels or the display of pixels in inches of the image. To convert the display to centimeters, you need to divide it by 2.54.

We can’t do anything, only whole.

The more it shows, the more clear and attractive it is to look at the images.

When choosing any technique, such as this, it is important to show respect for this performance.

Alone is not the main thing. It is also important to marvel at the technology and screen display.

In addition, be sure to pay attention to the capacity of the battery and find a happy medium between the number of pixels. and screen size.