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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
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
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
Close up - Tablet 1563
Complex incisions
Woodgrain
Surface discolouration
Warping
Cracking
Noisy image
Palimpsest
Long process
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
Gibson
http://greatparchmentbook.wordpress.com/ - with thanks to Tim Weyrich and Kazim Pal
http://www.ewarrenperryjr.com/2009/06/rehearsals-have-begun-in-chicago-for-ekphrasis-cave-walls-to-soup-cans.html
With thanks to
• eSAD Project– Prof Alan Bowman, Prof Mike Brady, Dr Ségolène Tarte, Dr Henriette Roued-Cunliffe
• Cultural Heritage Destruction Project– Alejandro Giacometti, Dr Adam Gibson, Lindsay MacDonald, Alberto Campagnolo, Simon
Mahony
• Great Parchment Book Project– Dr Tim Weyrich, Kazim Pal, Alberto Campagnolo, Philippa Smith, Caroline De Stefani, Rachael
Smither, Patricia Stewart, Nicola Avery.
• Science Museum Shipping Gallery– A Prugnon, J Hindmarch, Matthew Shaw, William Trossell, Anita Soni, Prof Stuart Robson