August 1999
Intermediate to advanced
559 pages
30h 44m
English
Content preview from Scientific Photography and Applied ImagingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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4 Light and radiation sources
4.1 Introduction
The processes of photography and imaging usually require a source of light (illuminant) or radiation to illuminate or to irradiate the subject, respectively. The subject itself may be luminous (‘bright’) by emitted light or radiation, such as the sun, stars, flames and radioactive sources. The subject and its surrounding environment or scene may be recorded with a ‘mixture’ of direct light and radiation from illuminants, by emitted light and ambient light, usually with one of these being dominant.
The spectrum of electromagnetic radiation (EMR) is divided into bands or zones by wavelength (λ), see Figure 4.1. The nominal 400-700 nm band is visible light, quantified by photometric units, otherwise ...
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