Food photography is a still life specialization of commercial
photography, aimed at producing attractive photographs of food
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Nicole S. Young has written:
'Food photography' -- subject(s): Photography of food, Artistic
Photography
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Linda Bellingham has written:
'Food styling for photographers' -- subject(s): Miscellanea,
Photography, Photography of food, Food presentation
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You can learn about food photography from a number of sources.
You can either get an instructional book from your local bookstore.
Failing that, searching for blogs and asking in forums is also a
good idea.