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Technische vragen en antwoorden 26
Technische vragen en antwoorden
Welke resolutie voor welk doel?
Gebruiksdoeleinde Resolutie Kleur-sterkte
Kleurenfoto, print 150 dpi 24-48 bits
Afbeeldingen met grijstinten 200 dpi 10 bits
Tekstherkenning 300 dpi 1 bit
Voor hogere kwaliteitseisen kunnen hogere waarden worden ingesteld die echter
aanzienlijk meer geheugen vragen en het scannen vertragen. Tekstherkenning functioneert
met de aangegeven waarden optimaal.
Benodigde opslagruimte voor verschillende resoluties
Het scannen van een item met een oppervlakte van 10 x 10 cm heeft bij de gegeven
resoluties de volgende opslagruimte nodig:
100 dpi 150 dpi 300 dpi 600 dpi
Lijntekening 19,5 Kb 44 Kb 44 Kb 703 Kb
Grijstinten 156 Kb 352 Kb 1,37 MB, 5,5 MB
Kleur 469 Kb 1 MB 4,12 MB, 16,5 MB
Wat betekent ...
Dpi (dots per inch) Maatstaf voor resolutie , aantal punten per inch.
Kleursterkte Aantal gelijktijdig weer te geven kleuren.
1 bit = 2^1 = 2 kleuren = zwart/wit
8 bits = 2^8 = 256 kleuren
16 bits = 2^8 = 65.536 kleuren
24 bits = 2^8 = 16.777.216 kleuren
OCR Tekstherkenning
Pixel Beeldpunt
Resolutie De verhouding van de weergegeven beeldpunten (pixels) tot het
oppervlak. Maatstaf is dpi.
TWAIN De standaard die de gegevensuitwisseling tussen optische
invoerapparaten (zoals scanners) en de computer mogelijk
maakt.
122


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