ScannersCaptureDevicesHomeDepartmentofComputerscannerscapture设备计算机家系.pptx

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CULBiasonImageCapture:
Createrichimagesthatareusefulovertimeinthemostcost-effectivemanner.
Setconversionrequirementsgreaterthanimmediateapplication
Promotereuseofcontent
Enablesharingofcomparableandtrustedresourcesacrossdisciplines,users,andinstitutions
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WhyRichDigitalMasters?
Preservation
Originalmayonlywithstandonescan
Maintenanceofdigitalfiles
Cost
Onescanmaybeallthatisaffordable
Conversioncostsdwarfedbyothercosts
Access
Manyfromone
Thericherthefile,thebetterthederivativeintermsofqualityandprocessibility
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Howtodeterminewhat’sgoodenough?
Connoisseurshipofdocumentattributes
Identifykeyinformationcontent
Objectivelycharacterizeormeasureattributes:size,detail,tone,andcolor
Appreciateimagingfactorsaffectingqualityandcost
Translatebetweenanaloganddigital
Equatemeasurementstodigitalequivalenciesandcorrespondingmetrics,.,detailsizeresolutionMTF
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CUL’sApproachtoImaging:“NoMore,NoLess”
Imagerequirementsandcost
imagequalityandutility
desiredpointofcapture
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DigitalImageQualityis GovernedBy:
resolutionandthreshold
bitdepth
colormanagement
imageenhancement
compressionandfileformat
systemperformance
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Resolution
Determinedbynumberofpixelsusedtorepresenttheimage
Increasingresolutionincreaseslevelofdetailcapturedandgeometricallyincreasesfilesize
zoomin
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EffectsofResolution
600dpi
300dpi
200dpi
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ThresholdSettinginBitonalScanning
definesthepointonascalefrom0to255atwhichgrayvalueswillbeinterpretedeitherasblackorwhite
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10
EffectsofThreshold
threshold=100
threshold=60
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