What is the difference between PPI and DPI?
By convention, when we talk about pixels per inch (PPI), we’re talking about the number of pixels in your image that are displayed per inch of display medium, e.g., monitor or paper. When we talk about dots per inch (DPI), we are typically talking about the number of individually controllable display elements that your display device can fit in an inch of display medium. A key difference is that when we talk about DPI, we’re typically talking about the capabilities of a display device, while when we talk about PPI, we’re talking about how much information you have squeezed per unit of display medium. Any time we change PPI, we change the output size or magnification of our image, whereas changing DPI doesn’t necessarily change the size or magnification of the image. The whole PPI vs. DPI distinction gets a bit confusing in the case of monitors. Monitors, especially LCD monitors, are best described in terms the number of pixels they can display per inch, but people often talk about moni
