PPI is an abbreviation for "pixels per inch" and it belongs to the image category of digitization. PPI is sometimes used interchangeably to the slightly different concept of DPI, which refers to "dots per inch" and might have a distinct meaning in certain situations. But they are often referred to as the same basic concept. PPI is usually used to characterize the capabilities of an imaging device or a digital image when it comes to the resolution. Basically, it describes the proficiency of a device such as a scanner to render the smallest units of information in the structure of an image.
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