Handbook of Forensic Services (pdf) - FBI

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ß ß Handbook of Forens c Serv ces 2007 The notat on “el m nat on pr nts” should be ncluded f the person pr nted s not a suspect. When known pr nts are subm tted separately from ev dence, reference prev ous commun cat ons and case- dent fy ng numbers and other pert nent nformat on. Submitting Latent and Intentionally Recorded Print Images in Digital Format D g tal mages, nclud ng d g tal photographs, of latent and ntent onally recorded pr nts should nclude a scale or other measurable tem. If a search of the Integrated Automated F ngerpr nt Identification System (IAFIS) is requested, a scale or other measurable tem s mandatory. D g tal mages, nclud ng d g tal photographs, must meet the follow ng requ rements: ß ß ß Documentat on of the mage source (e.g., w ndow, door frame). Documentat on of the capture dev ce (e.g., flatbed scanner, digital camera). Documentat on nd cat ng the mage s an or g nal capture. 86
ß ß Handbook of Forens c Serv ces 2007 F le propert es for latent mages cons st ng of: ü ü ü A file format without compression or with lossless compress on (e.g., RAW, TIFF). A m n mum of 8 b ts for grayscale mages and 24 b ts for color mages. A resolut on that meets or exceeds 1000 p xels per nch (PPI) when cal brated to actual s ze (1:1). F le propert es for ntent onally recorded pr nts cons st ng of: ü ü ü A file format without compression, with lossless compress on (e.g., RAW, TIFF), or w th Wavelet Scalar Quant zat on (WSQ) compress on saved at a max mum of 15:1. A m n mum of 8 b ts for grayscale mages and 24 b ts for color mages. A resolut on that meets or exceeds 500 PPI when cal brated to actual s ze (1:1). Latent pr nts subm tted as facs m les or photocop es w ll not be exam ned n the FBI Laboratory. 87
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Handbook of Forensic Services (pdf) - FBI

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