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[[File:Low pixel density vs high pixel density.png|thumb|Figure 1. High Pixel Density Vs Low Pixel Density (image: teknosrc.com)]]

[[File:Low pixel density vs high pixel density.png|thumb|Figure 1. High Pixel Density Vs Low Pixel Density (image: teknosrc.com)]]

Pixel density is the number of pixels in a certain amount of space and it describes the sharpness and clarity for different types of displays (i.e. computers, mobile devices, cameras, etc). Pixel density is often measured in Pixels per Inch (PPI) - the number of pixels present per inch on the display. A display's pixel density is different from its resolution, which is the total number of pixels across the display's width and height (Figure 1). <ref name=”1”>Nowell, P. (2016). Pixel Density, demystified: How pixel density works and how it affects your designs. Retrieved from https://medium.com/@pnowelldesign/pixel-density-demystified-a4db63ba2922</ref><ref name=”2”>Raghavendar, T.S. (2013). Resolution Vs pixel density in displays – all you need to know. Retrieved from http://teknosrc.com/resolution-vs-pixel-density-in-displays-all-you-need-to-know/</ref><ref name=”3”>Übergizmo. What is PPI: Pixels per inch, display resolution. Retrieved from http://www.ubergizmo.com/what-is/ppi-pixels-per-inch/</ref>

Pixel density is the number of pixels in a certain amount of space and it describes the sharpness and clarity for different types of displays (i.e. computers, mobile gadgets, cameras, etc). Pixel density is often measured in Pixels per Inch (PPI) - the number of pixels present per inch on the display. A display's pixel density is different from its resolution, which is the total number of pixels across the display's width and height (Figure 1). <ref name=”1”>Nowell, P. (2016). Pixel Density, demystified: How pixel density works and how it affects your designs. Retrieved from https://medium.com/@pnowelldesign/pixel-density-demystified-a4db63ba2922</ref><ref name=”2”>Raghavendar, T.S. (2013). Resolution Vs pixel density in displays – all you need to know. Retrieved from http://teknosrc.com/resolution-vs-pixel-density-in-displays-all-you-need-to-know/</ref><ref name=”3”>Übergizmo. What is PPI: Pixels per inch, display resolution. Retrieved from http://www.ubergizmo.com/what-is/ppi-pixels-per-inch/</ref>

==Calculating pixels per inch==

==Calculating pixels per inch==

where Wp is the horizontal number of pixels; Hp, the vertical number of pixels; and S, the screen size. As an example, a 32 inches TV with a resolution of 1080p (1920 x 1080 pixels) will result in a pixel density of 68.84 ppi. <ref name=”2”></ref>

where Wp is the horizontal number of pixels; Hp, the vertical number of pixels; and S, the screen size. As an example, a 32 inches TV with a resolution of 1080p (1920 x 1080 pixels) will result in a pixel density of 68.84 ppi. <ref name=”2”></ref>

PPI, while an important metric, cannot be used by itself as the standard for sharpness since the distance between the eyes and the display is also important. When the eyes are closer to a display, pixels may become visible; moving further away from a gadget that has additional pixel density may not be useful because the added pixel density will not be perceptible due to distance. Different devices are used at different ranges to the eyes: smartphones are used closer to the eyes then tablets, computer monitors are used a bit further away, and TV even farther. This means that for different devices there are distinctive PPIs to achieve the same perceived sharpness from the specific point of view of the user. <ref name=”3”></ref>

PPI, while an important metric, cannot be used by itself as the standard for sharpness since the distance between the eyes and the display is also important. When the eyes are closer to a display, pixels may become visible; moving further away from a gadget that has additional pixel density may not be useful because the added pixel density will not be perceptible due to distance. Different gadgets are used at different ranges to the eyes: smartphones are used closer to the eyes then tablets, computer monitors are used a bit further away, and TV even farther. This means that for different gadgets there are distinctive PPIs to achieve the same perceived sharpness from the specific point of view of the user. <ref name=”3”></ref>

==Pixel density in Virtual Reality==

==Pixel density in Virtual Reality==