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Digital Imaging and Preservation

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 and Preservation

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  1. Digital Imaging and Preservation

  2. Digital Imaging • Digital images adalah “electronic photographs” yang di scan daridokumen original.

  3. 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.

  4. 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

  5. Tipe scanning • Raster scanning • Optical Character recognition • Vector scanning

  6. Kelebihandankekurangandari digital image • Advatage: • Duplikasitanpadegradasi • Mudahdimanipulasidandi-enhance • Preview capability • Secararelatiflebih permanent • Output fleksibel

  7. Kekurangan • Pemeliharaanygintensif • Teknologiygterusberubah • Komitmenjangkapanjangdarisegidanadansumberdaya.

  8. Selection Criteria • Penggunaan digital imaging untuktujuanpreservasimerupakankomitmendariberbagaisumberdayauntukwaktu yang sangat lama

  9. Kriteria: • Value • Condition • Use • Characteristics of original • Acceptability of the resulting digital object • Access aids

  10. 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.

  11. 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.

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