Pixel density in a troubled world
A blog post on the role of pixel density when developing mobile apps.
Whereas in the past user interface design would largely be concerned with screen size or display resolution only, now the question of how many pixels make up one inch becomes relevant as well. This measure is called pixel density, and expressed in dpi or ppi values. Nowhere is pixel density as broadly distributed as in the mobile world. A low-end android mobile may have a 180 dpi screen, while a high-end one, like the retina display, will boast up to a 326 dpi screen.