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Langford's Basic Photography, 9th Edition by Richard Sawdon Smith, Anna Fox, Michael Langford

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Having composed and formed the picture in the camera the next step is to make the image permanent. Digital image capture is increasingly used, recording images as electronic signals from a CCD panel (Chapter 6), but a huge amount of photography relies on chemically coated film as the image-recording medium because of its fine quality of results and lower equipment costs. Once film is exposed and processed it can be printed onto chemically coated papers or electronically scanned (Chapter 14), allowing more adjustments to be made to pictures than ever before.

Light-sensitive compounds of silver have been used from the earliest days of photography ...

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