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Contrast enhancement of bite mark images using the greyscale mixer in ACR in Photoshop®

Evans, Sam, Noorbhai, Suzanne, Lawson, Zoe Frances, Stacey-Jones, Seren and Carabott, Romina 2013. Contrast enhancement of bite mark images using the greyscale mixer in ACR in Photoshop®. Journal of Forensic Sciences 58 (3) , pp. 804-810. 10.1111/1556-4029.12085

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Abstract

Enhanced images may improve bite mark edge definition, assisting forensic analysis. Current contrast enhancement involves color extraction, viewing layered images by channel. A novel technique, producing a single enhanced image using the grayscale mix panel within Adobe Camera Raw®, has been developed and assessed here, allowing adjustments of multiple color channels simultaneously. Stage 1 measured RGB values in 72 versions of a color chart image; eight sliders in Photoshop® were adjusted at 25% intervals, all corresponding colors affected. Stage 2 used a bite mark image, and found only red, orange, and yellow sliders had discernable effects. Stage 3 assessed modality preference between color, grayscale, and enhanced images; on average, the 22 survey participants chose the enhanced image as better defined for nine out of 10 bite marks. The study has shown potential benefits for this new technique. However, further research is needed before use in the analysis of bite marks.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Dentistry
Information Services
Medicine
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
R Medicine > R Medicine (General)
T Technology > TR Photography
Publisher: Wiley-Blackwell
ISSN: 0022-1198
Last Modified: 19 Dec 2017 04:08
URI: http://orca-mwe.cf.ac.uk/id/eprint/33638

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