When you are talking about digital images, screens, monitors or even cameras, it is common to mention pixel density. But what exactly is pixel density?
Simply put, pixel density is what clearly describes the clarity and the sharpness. In other words, pixel density is the number of pixels that a specific display has. Traditionally, the pixel density is measured in PPI (Pixels Per Inch). So, you can say that the higher the pixel density, the higher it is the clarity and sharpness of the display. However, some people prefer to measure the pixel density in PPCM (pixels Per Centimeter).
Discover how to convert inches to pixels and vice-versa.
One of the things that you need to know about pixel density is that usually, vertical and horizontal density are the same since most displays have square pixels. However, there are some specific displays that can have non-square pixels.
So, how can you tell the pixel density of a specific display?
When you want to discover the pixel density of a specific display, you can use a simple formula:
Pixel Density= √[(Horizontal Number of Pixel^2) + (Vertical Number of Pixel^2)] / Screen Size
Does The Size Of The Screen Matter?
If you like to see the new trends in terms of computers, laptops, tablets, smartphones and even TVs, you probably already noticed that we have, on the market, the two extremes: the extremely large displays that can be hard to use on a daily basis, and those tiny displays. So, should you expect to have a lower pixel density on a small display than on a larger one?
The answer to this question isn’t unanimous since it depends on the displays. Nevertheless, you need to know that just because you are using a smaller display, this doesn’t mean that you have a lower pixel density than if you were using the larger display in the world.
Discover how to read an inches to pixels conversion chart.
So, let’s make a simple comparison of two different displays:
#1: A 32 inches Full-HD TV:
Let’s say that you have a 32 inches full HD TV at home and that you know it has a resolution of 1080p. This means that the screen displays the content at 1920 X 1080 pixels.
So, by applying the formula we showed above, the pixel density of this full HD TV is:
Pixel Density = √[ (1920^2) + (1080^2) ] / 32 = 68.84 PPI
How can you convert 3.5 cm in pixels?
#2: iPhone 7:
The iPhone 7 has a resolution of 1334 X 750 pixels. In addition, we know that the screen measures 4.7 inches.
So, by applying the formula of pixel density we mentioned above, the pixel density of the iPhone 7 is:
Pixel Density = √[ (1334^2) + (750^2) ] / 4.7 = 326 PPI
As you can see by comparing the 32 inches Full HD TV and the iPhone 7, the iPhone 7 clearly wins in terms of pixel density even though the screen is a lot smaller than the one on the TV. This is the reason why you are able to perfectly read, write and use the iPhone 7 even though the screen is a lot smaller.
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