1. DPI: is a measure of spatial printing or video dot density, in particular the number of individual dots that can be placed in a line within the span of 1 inch.
2. PPI: Measurement of image resolution that defines the size an image will print.
3. Metadata: Predictably, metadata in photography is information that describes not just some random documents and files, but image files. As with all sorts of metadata, it contains information on who made it, when, using what. Certain metadata entries are generated automatically by the camera.
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