Photography: marks, impressions, and documents

Porter, Glenn (2009) Photography: marks, impressions, and documents. In: Jamieson, Allan, and Moenssens, Andre, (eds.) Wiley Encyclopedia of Forensic Science. Wiley-Blackwell, pp. 2036-2056.

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Photographic and optical enhancement of physical evidence is an important criminalistics function. It provides nondestructive methods of improving the visualization of evidence to allow further forensic examination. The key concepts and techniques involving optical, photographic, and digital imaging techniques are examined in this section. Critical foundation aspects found in quality forensic photography such as maintaining the dimensional integrity of evidence and the representation of scale are described to ensure forensic photography principles. Attributes required for optical enhancement including the relationship between the spectral distribution of the light source, the spectral properties of the specimen, and spectral sensitivity of the recording media are unpacked and provide a theoretical basis. Optic enhancement techniques such as absorption, reflection, transmission, and photoluminescence modes are discussed with samples illustrating those optical effects. Digital imaging enhancement techniques to increase the contrast and the modification of color using Adobe Photoshop™ are explained.

Item ID: 34040
Item Type: Book Chapter (Research - B1)
ISBN: 978-0-470-06158-9
Keywords: forensic photography; monochromatic lighting; digital cameras; Polilight; image integrity; spectral sensitivity; optical enhancement; absorption mode; reflection mode; transmission mode; photoluminescence mode; Photoshop
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Date Deposited: 20 Nov 2017 00:26
FoR Codes: 19 STUDIES IN CREATIVE ARTS AND WRITING > 1902 Film, Television and Digital Media > 190299 Film, Television and Digital Media not elsewhere classified @ 100%
SEO Codes: 95 CULTURAL UNDERSTANDING > 9502 Communication > 950205 Visual Communication @ 100%
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