8
SCANNING
FINGER CONDITIONS
VERY MOIST FINGERS
· Result: Images too dark, poorly defined. Indicates too much moisture
on the fingers.
· Solution: Dry the fingers with a towel or cloth before
fingerprint capture.
· The resultant images will be lighter and the NFIQ quality scores
will improve.
VERY DRY FINGERS
· Result: Images take several seconds to appear or contrast appears
lighter than desired.
· Solution: Rub a small amount of moisturizer on the fingertips.
(Do not slather.)
· The resultant images will be darker and the NFIQ quality scores
will improve.
· Gentle or light contact with the plate is recommended in scanning.
Placing extra pressure on the hand is not recommended.
· Avoid using hand sanitizers, alcohol based lotions, and baby wipes
prior to scanning.
BEST PRACTICES
· Never put a wet hand on the scanner i.e., just washed and not
thoroughly dried, holding a bottle of liquid that leaves condensation
on your hand. Hands should be wiped dry.
· Never use two hands on the scanner at the same time
(see image on next page).
Dry FingerprintsNormal Fingerprints Wet Fingerprints
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