Pixels Per Inch
Pixels Per Inch (PPI) is a measurement of pixel density that expresses how many pixels are contained within one linear inch of a display or digital image. It is calculated by dividing the total number of pixels along one dimension by its physical size in inches along that same dimension. Higher PPI values indicate greater pixel density and typically result in sharper, more detailed visual output at normal viewing distances.
Display and Imaging Applications
PPI is commonly specified for digital displays, including monitors, smartphones, tablets, and printers. For screens, PPI determines how fine or crisp text and images appear to the viewer; most people find displays with 100+ PPI difficult to distinguish individual pixels at typical viewing distances. In digital photography and image editing, PPI relates to the resolution needed for printing at a given physical size, affecting the quality of printed output.
Practical Considerations
The perceived sharpness of a display depends not only on PPI but also on typical viewing distance. A smartphone held close to the eye may require higher PPI than a desktop monitor viewed from farther away to achieve comparable visual clarity. PPI is sometimes confused with screen resolution (total pixel count), but they measure different properties—a 1920×1080 display can have varying PPI depending on its physical screen size.
Source Notes
- 2026-04-14: “But OpenClaw is expensive…”