# What is a pixel?

Pixel, a unit of digital image length, is a minute area of illumination on a display screen, one of many from which an image is composed. In digital imaging, a pixel, pel, or picture element is a physical point in a raster image, or the smallest addressable element in an all points addressable display device; so it is the smallest controllable element of a picture represented on the screen.

### What is a pixel simple definition?

The pixel (a word invented from “picture element”) is the basic unit of programmable color on a computer display or in a computer image. Think of it as a logical – rather than a physical – unit. The physical size of a pixel depends on how you’ve set the resolution for the display screen.

### How does it work?

When we see graphic images on digital devices the display divides the screen into thousands or millions of pixels, arranged in rows and columns. Each pixel has its own address in this grid and is represented by dots or squares. Pixels build up a sample of an original image and are the smallest component of a digital image. The more pixels used to represent an image, the closer it will resemble the original.

### How big is a pixel?

Pixels, abbreviated as “px”, are also a unit of measurement commonly used in graphic and web design, equivalent to roughly 1⁄96 inch (0.26 mm). This measurement is used to make sure a given element will display as the same size no matter what screen resolution views it.

### How do I calculate pixels?

To calculate Pixel per Inch (PPI) follow the following steps :
1. Use the Pythagorean Theorem and the screen width and height in pixels to calculate the diagonal length in pixels:

2. Use the formula to calculate PPI, dividing the length of the diagonal in pixels by the length of the diagonal in inches
PPI = diagonal in pixels/diagonal in inches
The number of pixels per inch or PPI tells you how many pixels are in a 1 inch line on a display screen. The PPI will be the same whether it’s a horizontal or vertical or diagonal inch because pixels are square and therefore symmetric. If a display does not have square pixels then this calculator does not apply.
You can use the same PPI formula above to calculate pixels per centimeter, PP cm. Just substitute cm for inches to find PP cm.

### What is pixel and pixel resolution ?

Resolution refers to the number of pixels in an image. Resolution is sometimes identified by the width and height of the image as well as the total number of pixels in the image. For example, an image that is 2048 pixels wide and 1536 pixels high (2048 x 1536) contains (multiply) 3,145,728 pixels (or 3.1 Megapixels).

### What information is stored in pixels ?

Information is stored as bits. The more bits per pixel that are stored, the more colors a pixel can represent. • Did you find this article helpful and informative? If you have any further queries or questions feel free to connect to us. Give us feedback so we can improve.