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Real World Digital Photography, 2nd edition by Tim Grey, Seán Duggan, Katrin Eismann

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Resolution = Information

Resolution is one of the most important concepts to understand in digital imaging and especially in digital photography. The term resolution describes both pixel count and pixel density, and in a variety of circumstances these concepts are used interchangeably, which can add to misunderstanding.

Camera resolution is measured in megapixels (meaning millions of pixels); both image file resolution and monitor resolution are measured in either pixels per inch (ppi) or pixel dimensions (such as “400 by 600 pixels”); and printer resolution is measured in dots per inch (dpi) (Figure 2.1). In each of these circumstances, different numbers are used to describe the image, making it difficult to translate from one system of measurement ...

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