Handbook of Forensic Services (pdf) - FBI
Handbook of Forensic Services (pdf) - FBI
Handbook of Forensic Services (pdf) - FBI
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6.<br />
7.<br />
8.<br />
9.<br />
<strong>Handbook</strong> <strong>of</strong> Forens c Serv ces 2007<br />
Block out br ght amb ent l ght w th a<br />
sunscreen to max m ze the l ght from the<br />
flash.<br />
Focus on the bottom <strong>of</strong> the mpress on,<br />
not on the scale. Take an ex st ng- or<br />
reflected-light photograph.<br />
Position the flash at a very low angle<br />
(10–15 degrees) to the mpress on. Th s<br />
w ll enhance the deta l <strong>of</strong> the mpress on.<br />
For consistent exposure, hold the flash at<br />
least 5–7 feet from the mpress on. Shoot<br />
several exposures, bracket ng toward<br />
overexposure to obta n max mum mage<br />
detail. Move the flash two or more angles<br />
to the mpress on.<br />
Take the exposures, move the l ght to<br />
another pos t on, adjust the sunscreen,<br />
and repeat Steps 7 and 8.<br />
Impressions in Snow<br />
Impressions in snow are difficult to photograph<br />
because <strong>of</strong> lack <strong>of</strong> contrast. F rst, attempt to<br />
photograph the mpress ons as f n so l. To<br />
ncrease the contrast, l ghtly spray snow<br />
mpress ons w th Snow Pr nt Wax, a mater al used<br />
for cast ng snow mpress ons, or w th colored<br />
spray pa nt. Hold the spray can at least 2–3 feet<br />
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