Rare and Special in the Digital Environment: Damaged Texts and Digitisation Technologies Professor Melissa Terras Professor of Digital Humanities, UCL Dept of Information Studies Co-Director, UCL Centre for Digital Humanities [email protected], @melissaterras
32
Embed
Rare and Special in the Digital Environment: Damaged Texts and Digitisation Technologies Professor Melissa Terras Professor of Digital Humanities, UCL.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Rare and Special in the Digital Environment: Damaged Texts and Digitisation Technologies
Professor Melissa TerrasProfessor of Digital Humanities, UCL Dept of Information StudiesCo-Director, UCL Centre for Digital [email protected], @melissaterras
http://ericwilliamcarroll.com/blog/?m=201203
Image Quality 1: Resolution
The higher the resolution, the higher the quality of image.
20 dpi 72 dpi 300 dpi
Image Quality 2: Bit Depth
• Use bi-tonal: when shading is not an issue
– modern printed books– Line art– But high res to capture detail
• Use Grey-scale: tones of Grey– black and white photographs,
half-tone illustrations, typescript, archival materials in black and white
– Where colour isnt important• Use colour whenever colour is
present in the original and it conveys meaning– Trade off in file sizes
Compression and File Formats
Biblia Latina, Petrus Angleus de Monte Ulmi , 1492
The first printed edition of Euclid, translated by Adelardus of Bath and with the commentary of Novarese, 1482
http://digitool-b.lib.ucl.ac.uk
http://theartofgooglebooks.tumblr.com
Close up - Tablet 1563
Complex incisions
Woodgrain
Surface discolouration
Warping
Cracking
Noisy image
Palimpsest
Long process
Image processing: illumination correction
Original image After illumination correction
After woodgrain removal
Image processing: woodgrain removal -1
Original image
With thanks to Dr Segolene Tarte, eSAD project, OeRC
Transmittance factors of 21 optical bandpass filters in the visible spectrum – with thanks to Lindsay Macdonald
Syriac Galen Palimpsest (see http://digitalgalen.net/ ) – with thanks to Alejandro Giacometti, and Adam