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The DSLR Field Guide by Michael Freeman

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The fact that digital images exist as a hugely complex series of binary 1s and 0s renders them extremely fragile in a number of ways.

First, as they have only a digital presence, not a physical one, this puts them at a considerable risk of being altered unintentionally, deleted, or corrupted. The very simplicity and immediacy of recording digital images, which revolutionizes photography in certain ways, also makes them intangible and temporary—until they are processed and stored.

Second, there are no unique originals in digital photography, although Raw files can be regarded as such. Instead, there are versions. In film photography, the exposure onto one frame of film is a unique event, and that film becomes the master image—this ...

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