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ScannersCapture Devices - Home Department of Computer scannerscapture设备计算机家系.ppt

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WhatareDigitalImages?
Electronicsnapshotstakenofasceneorscannedfromdocuments
samplesandmappedasagridofdotsorpictureelements(pixels)
pixelassignedatonalvalue(black,white,grays,colors),representedinbinarycode
codestoredorreduced(compressed)
readandinterpretedtocreateanalogversion
CULBiasonImageCapture:
Createrichimagesthatareusefulovertimeinthemostcost-effectivemanner.
Setconversionrequirementsgreaterthanimmediateapplication
Promotereuseofcontent
Enablesharingofcomparableandtrustedresourcesacrossdisciplines,users,andinstitutions
WhyRichDigitalMasters?
Preservation
Originalmayonlywithstandonescan
Maintenanceofdigitalfiles
Cost
Onescanmaybeallthatisaffordable
Conversioncostsdwarfedbyothercosts
Access
Manyfromone
Thericherthefile,thebetterthederivativeintermsofqualityandprocessibility
Howtodeterminewhat’sgoodenough?
Connoisseurshipofdocumentattributes
Identifykeyinformationcontent
Objectivelycharacterizeormeasureattributes:size,detail,tone,andcolor
Appreciateimagingfactorsaffectingqualityandcost
Translatebetweenanaloganddigital
Equatemeasurementstodigitalequivalenciesandcorrespondingmetrics,.,detailsizeresolutionMTF
CUL’sApproachtoImaging:“NoMore,NoLess”
Imagerequirementsandcost
imagequalityandutility
desiredpointofcapture
DigitalImageQualityis GovernedBy:
resolutionandthreshold
bitdepth
colormanagement
imageenhancement
compressionandfileformat
systemperformance
Resolution
Determinedbynumberofpixelsusedtorepresenttheimage
Increasingresolutionincreaseslevelofdetailcapturedandgeometricallyincreasesfilesize
zoomin
EffectsofResolution
600dpi
300dpi
200dpi
9
UtilizingSufficientBitDepth
8-bitcolor
24-bitcolor

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