Full Form of PPI

Full Form of ppi: Pixels per inch

Category: Technology > Imaging and printing

Type: Initialism

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what does Full form of ppi mean?

Digital image or video screen’s resolution is measured in pixels per inch (PPI). A pixel is an area of illumination or color on a screen or computer image.

The display resolution or pixel density of a computer screen is measured by PPI. The measure is also used to indicate the resolution of a digital image, as well as the resolution capacity of a camera or a scanner capturing an image.

Explanation of Full form of ppi

There are many ways to implement PPI in different devices. It depends on the display resolution of the adapter. PPI in computer display devices is calculated by multiplying the diagonal resolution of a display device by the diagonal size in inches. A display monitor measuring 12 inches in width and 9 inches high has a PPI value of 85, both horizontally and vertically. A higher resolution will lead to a higher PPI. The image views will also be better if there is more PPI. This holds true for both computers and printing devices.

Pixel density - Wikiwand

How to calculate ppi

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PPI stands for Pixels Per Inch and is a metric typically used to describe the pixel density (sharpness) for all sorts of displays, including cameras, computers, mobile devices, etc… It is important to understand what it really means in a world where visual computing and visual quality has increased exponentially over the past decade, and where PPI has become a prime marketing tool.

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Although PPI is an interesting metric it can’t be used as a benchmark for sharpness. The distance between your eyes and the display is just as important as its pixel density. The pixels will be visible if the screen is closer to your eyes. The additional pixel density won’t be visible if the device is moved further away. Smartphones are more closely related to your eyes than tablets. Computer monitors, TVs and cinema screens are all a bit further away. To achieve the same level of sharpness, different PPIs are required.

Snellen_chart_partial

Let’s look at how human visual acuity is measured: we have all heard of “20/20 vision”, and it would make sense to think that it means “perfect” or “maximum” vision, but that’s not true at all. The 20/20 vision test comes from the Snellen chart (on the right), which was invented in 1860 as a mean to measure visual acuity for medical purpose. This is significant because Snellen was trying spot low-vision which is a medical issue. There has never been a medical patient who complained about having a higher than average visual acuity.

20/20 vision is actually a sign that you have normal vision. This assumes that most people can read all letters at 20 feet (6 meters or more). 20/20 is simply “average” vision. Poor vision can only read the letters on the top row at 20 feet. Most people can read them at a greater distance.

The 300 PPI limit is just marketing.

Many times you may have heard that the human eye can’t distinguish details beyond 300 ppi. This has been a common belief for many years, especially when it comes to Print work. Recently, however, that myth was brought into the mobile world by the release of the iPhone 4.

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This paragraph is crucial to understand the 300 PPI claim made by Apple when the iPhone 4 was released. Steve Jobs, Apple’s CEO, implied that sharpness is beyond 300 PPI for Smartphone users.

Steve Jobs believed that your phone/tablet should be held between 10-12 inches and your eyes. There was a lot of controversy, but astronomer Phil Bait wrote a good article saying that it depends on how you look at it. He is less divided than some of the articles at that time.

The 300 PPI claim of Mr. Jobs may be a little bit true if you refer to the 20/20 vision. The big caveat is that 20/20 vision doesn’t necessarily represent perfect vision. The real human vision limit is much higher than this – perhaps closer to 900 PPI depending on whom you speak to. Sun Microsystems research has shown that the limit is at least 2X greater than 20/20 vision (pdf link). Sharp believes humans can see up 1000 PPI (pdf Link).

What is PPI: Pixels Per Inch, Display Resolution | Ubergizmo

Although the limits of vision in humans are still being studied, it is clear that there is an upper limit to human vision. This would be applicable for most of the population. First, we need to understand how visual clarity is measured from the eye’s perspective. We have come across the “arc minute” and “minute of arc” as the most commonly used metric.

Arc minutes measure the size of things we see in terms of visual angle. This is convenient as it allows us to describe the size of things in terms of their perceived dimensions. Others suggested using pixels per (visual degree) degree as a metric. This may be easier to understand. That metric would make 20/20 vision more or less equal to 58 pixels per (visual) degree. Sony cites that NHK research has measured human visual acuity to 312 pixels per degree while research from NASA

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Although there isn’t a definitive answer, the majority of research indicates that 300 PPI doesn’t represent the limit of human visual acuity in the context Smartphonee displays.

PPI, Retina displays, and what makes a screen 'good' | Scottie's Tech.Info

We know from personal experience that high DPI displays, such as the iPhone 4, can be seen beyond 300 DPIs. We don’t know how far we can go, but we do agree that there will be a point where diminishing returns.

It all depends on your vision. We have found that most smartphone owners with a higher PPI than 300 can see a difference in sharpness. This is particularly true when you are looking at photos of nature scenes or text and icons.

It is important to understand that discerning details beyond 300 PPI isn’t a superhuman feat. This is a natural gift that only a few people have. You may be able to see more detail than the 20/20 chart in 1860.

The display’s ability to output a lot of detail isn’t just about what we are able to see. NHK Japan researchers point out that larger pixels and more details make the image appear more real. That’s probably why many people say that 4K TV seems more “real” than 3D TV.

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