Creating visual resources Visual artefacts, photographs and large format originals.
-
Upload
anna-hunter -
Category
Documents
-
view
221 -
download
0
Transcript of Creating visual resources Visual artefacts, photographs and large format originals.
Creating visual resources
Visual artefacts, photographs and large format originals
Content of this session
Visual artefactsTypes and characteristics of photographsMethods of captureMethods of providing accessSpecial handling
Visual artefacts
Huge category of visual materialspaintings and drawingsfabricsart objectstechnical drawingsmaps3-D objects
Croyland, Lincolnshire, John Sell Cotman
Bacchanal, Cecily Brown
Suffragette Banner, Women’s Library
A Cosy Couple, Amanda Francis
Technical drawing design
1930 map locating Painswick village inside folded printed change of address flier for Pyllis Barron and Dorothy Larcher
Spellman Music Covers Collection, Reading University
Types of photographs
Wide rangePrintsNegatives (acetate, nitrate, glass plates, paper)TransparenciesSlidesDaguerreotypes and other special formatsDigital originals
Dressmaking class 1936: preparation for dress parade
John Ruskin's Daguerreotype of a group of windows in the façade of the Casa degli Zane, Venice
Glass plate negative
35mm B&W negative
Digital original
Characteristics of photographs
Multiple versions possible
Negative and the print and copy photography
Colour and monotones – fidelity is vital
May be fragile, dirty and even combustible
May be flexible or rigid, mounted or in strips (e.g. albums, slides, negative strips)
Will probably need special handling
Will benefit from specialist equipment
Capture methods for visual artefacts and photographs
Digital Imaging
digital cameras (as for manuscripts)
Scanning
flatbed scanners – primarily for prints and plates
drum scanners – primarily for transparencies
film scanners – specialist high end products
slide scanners – slides and transparencies
Handling
Every single interaction with a fragile original can compromise it
Many of these may be hundreds of years old …
… we want them to last for hundreds more years
So special handling is crucial
Handling
Conservation practice in human handling
Heat levels – most critical due to build up
Light levels
Dust-free environment
Image Quality
How do we know if it is good enough?Visual sharpnessLaterally reversed imagesDirtSkewImage completeness
Guidance available from the RLG Publications by Franziska Frey (Rochester Institute of Technology)
Case Study: CVMA
Corpus Vitrearum Medii Aevi – medieval stained glass
The content is only renderable from photographs of the subject.
Comprehensive database with high levels of descriptive metadata.
Further additions will include maps and church plans linked to window images.
Specifications of CVMA Digitisation
Source:35mm slides, medium & large format transparencies, photographic prints
Scanning dpi:35mm – 2,700 dpiMedium format – 1,200 dpiLarge format – 1,000 dpiPrint – 600 dpiAll 24-bit RGB colour
File formats:TIFF master (uncompressed)JPEG for web
Courtesy of CVMA Project, Courtauld Institute of Art
Case Study: Shetland Isles Museum
Glass plate collection - >80,000 items
In-house scanning using flatbed scanners
600 dpi, 8-bit greyscale specification
Delivered on the web with the option to buy content.
Online images are thus relatively small.
Large format originals
Maps
Drawings
Technical drawings – engineering or architectural
Very hard to scan – photographic surrogate is often the best method
Accurately representing scale is difficult
Representing this content online is difficult
Digitization options for 3-D objects
What do we mean by 3-D objects?Anything!SculpturePublic monumentsMachineryArchaeological artefactsBuildingsBooks
Digitization options for 3-D objects
What are the options?
2-D photography in single shots
2-D photography in multiple shotsresultant images stitched into a 3-D rendition using Quicktime
Video
Use of programs such as Macromedia Shockwave to create 3-D Virtual Reality
A Cosy Couple, Amanda Francis, 2-D photograph
Lewis and Clark magnetic compass
108 photographs stitched together
Quicktime VR
The Tibetan and Himalayan Digital Library, University of Virginia
The Tibetan and Himalayan Digital Library, University of Virginia
The Tibetan and Himalayan Digital Library, University of Virginia
Panorama
Eternal Egypt Project
Shockwave
Eternal Egypt
Shockwave