Abstract
Colour photography uses films and printing papers that incorporate gelatin dispersions of silver halide crystals as light-sensitive elements. About one micrometer in size, these crystals are insensitive at wavelengths greater than approximately 500 run and require development to reveal the effects of exposure. This paper describes methods by which photographic materials can ‘see’ most of the visible spectrum, how colours of subjects are analysed and how final images are synthesised, all within layers a few microns thick.
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