What is DPI or PPI?

DPI stands for Dots Per Inch in printing. The more dots per square inch, the higher the visual quality of the printed material. PPI, or Pixels Per Inch, is more commonly used for digital displays, but it also relates to the image quality per physical inch. Both DPI and PPI are often referred to as resolution.

Images made up of pixels or dots are known as raster images. Each tiny pixel is assigned a color, and all the pixels together form the entire image. Raster images are most commonly seen in digital cameras, scanners, and monitors.

Because resolution is directly related to the physical size of the image, if you take an image that is 1" x 1" at 300 DPI and scale it up to 2" x 2", the 300 DPI becomes 150 DPI, as the dots are spread over a larger area, reducing the resolution.

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