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Digital Imaging and Preservation. Digital Imaging. Digital images adalah “electronic photographs” yang di scan dari dokumen original. . Empat kategori image yang dapat di digitize: Teks atau line art. Biasanya monochrome dan tidak memiliki tonal variation.

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digital imaging
Digital Imaging
  • Digital images adalah “electronic photographs” yang di scan daridokumen original.
slide3

Empatkategori image yang dapatdi digitize:

    • Teksatau line art. Biasanya monochrome dantidakmemiliki tonal variation.
    • Continuous tone. Memilikigradasi yang bervariasidenganlembut, dapat monochrome atauberwarna. Cth, photographs danbbrpkaryaseni
    • Halftone or halftone-like. Memilikipolaberupatitikataugaris. Cth, engravings dan etchings
    • Mixed. Memilikiteksatau line-art dan continuous atau half tone. Cthkoran, majalah, danilustrasipadabuku.
scanning types
Scanning types

Teknik Scanning

  • Bitonal. Satu bit per pixel merepresentasikanhitamatauputih.
  • Grayscale. 2-8 bits per pixel merepresentasikangradasiabu-abu
  • Color. 6-24 bits per pixel merepresentasikanwarnacocokuntuksemuadokumenberwarna
slide5

Tipe scanning

  • Raster scanning
  • Optical Character recognition
  • Vector scanning
slide6

Kelebihandankekurangandari digital image

  • Advatage:
    • Duplikasitanpadegradasi
    • Mudahdimanipulasidandi-enhance
    • Preview capability
    • Secararelatiflebih permanent
    • Output fleksibel
slide7

Kekurangan

    • Pemeliharaanygintensif
    • Teknologiygterusberubah
    • Komitmenjangkapanjangdarisegidanadansumberdaya.
selection criteria
Selection Criteria
  • Penggunaan digital imaging untuktujuanpreservasimerupakankomitmendariberbagaisumberdayauntukwaktu yang sangat lama
slide9

Kriteria:

    • Value
    • Condition
    • Use
    • Characteristics of original
    • Acceptability of the resulting digital object
    • Access aids
image quality
Image Quality
  • Equipment calibration
  • Resolution. Menggunakan high resolution agar manipulasidimasaygakandatangdapatdilakukan. Minimum 300 dots/inch (dpi)
  • Image enhancement.
  • Compression. Untukmereduksi volume dari file yang besar, terutama images.
guidence
Guidence
  • Untuk scan berbagaijenis material:
  • Published text/line. 600 dpi bitonal.
  • Illustrated text. 600 dpi bitonaldengan enhancement
  • Halftones. 600 dpi bitonalatau grayscale
  • Archival document: untukdokhasilmesintik, tulistangandll, cukup binary scanning 300 dpi. Dokumenygrusak, ternoda, ataumulaihilangmembutuhkan 300 dpi binary dengan gray atau color. Papirus, 600 dpi, 24 bit color scanning.