The textbook of digital photography.

Dennis P. Curtin wrote here a very complete and comprehensive ebook about digital photography.

The author speaks about all aspect of the digital photography, as well as all the aspect of the material, the digital workflow, the post processing, how exposure affect your images, the controls vs automatics mode and so on...

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http://www.photocourse.com/download/Textbook-of-Digital-Photography-samples.pdf