Digital Images: Sourcing, adapting and safe keeping
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1 Digital Images: Sourcing, adapting and safe keeping Dave Baker (Vicky Brown) IT Learning Programme
2 Outline what we are covering
3 Image discovery Image creation Image care and use
4 Image discovery where can I get images?
5
6 Don t forget to use your librarian!
7 OxLIP+
8
9 1,600 museums, galleries, institutions and private collections 8,000 geographical locations 30,000 artists 3,000 frescoes 1,800 oils 32,000 engravings, lithographs & prints 7,000 manuscripts 22,600 ceramics 17,000 photographs 11,000 sculpture 16,000 images of architecture
10 The Bodleian Library Special Collections
11
12 The World War One Poetry Digital Archive
13
14 There are many sources for images on the web
15 C CC BY ND NC SA share Share, Remix, Reuse Legally remix public domain zero
16 Copyright a few words from Mike Heaney
17 Exercises 1, 2, 3
18 Image creation cameras, scanners, editors
19
20 What is a digital image? pixels
21 colours
22 If we need more colours then we need to use bigger numbers for each pixel 0 to 1 0 to to 16,777, red x 256 green x 256 blue
23 75x x1863 The number of pixels in an image is a measure of image resolution (or detail) resolution
24 Image quality is subjective and in the eye of the beholder quality
25 Remember: Digital images are just numbers
26 Lossless compression preserves the detail TIFF, RAW 28 A B C D 9 A B C B A C A D B 26
27 Lossy compression loses detail JPEG 28 y = x x x x x
28 Lossy compression = poorer quality KB 50KB 32KB 17KB 11KB
29 So, there is a choice of image formats. Which format is best? Format Compression Quality Compatibility Longevity JPEG TIFF DNG RAW WebP??
30
31 Scanning is one method of image creation: Good quality in means good quality out Best input Appropriate resolution TIFF Correct format
32 Chose the appropriate scanning resolution Size for size For print: 300 dpi For screen: 150 dpi Read the course notes!
33 There are many tools that allow you to improve your digital images
34
35 A free, powerful image editing tool GIMP
36 Exercises 4, 5, 6
37 Image care and use cataloguing, using, safe-keeping
38 Cataloguing
39 Web based image management is often through social networking web sites
40 Locally based image management software is more powerful
41 Google Picasa is a free to use image cataloguing program picasa.google.co.uk
42 Metadata is embedded in some digital images and can be extended by tagging Manufacturer Kyocera Model M410R Orientation top - left Software Ver1.01 Date and Time 2003:08:11 16:45:32 Compression JPEG compression x-resolution y-resolution Resolution Unit Inch Exposure Time 1/659 sec. FNumber f/4.0 Metering mode Pattern Flash Flash did not fire Focal Length 40.5 mm Italy Montisi Pageant Woman Hand
43 Tagging (keywording) needs some thought Automobile? Car? Cars? Automobiles? vocabulary
44 Using
45 High quality printed images need 300 dpi (300 dpi = 120 dpcm) Poster 6 6 x 300 dpi 1800 dots
46 Screen images (PowerPoint) need 150 dpi (150 dpi = 60 dpcm) Read the course notes!
47 Beware of automatic image optimisation in PowerPoint and Word Open + Resize Save
48 ARTstor OIV is designed for high resolution images
49 Safe-keeping
50 There is a well tried image process
51 Keeping your images safe 3 copies 2 media 1 offsite
52
53 Exercises 7, 8, 9
54 IT Learning Programme Oxford University Computing Services
55 This presentation is made available by Dave Baker under a Creative Commons licence: Attribution-NonCommercial-NoDerivs CC BY-NC-ND
56 Andercismo flickr.com c BY NC SA bmhkim flickr.com c BY NC UNESCO Lacoste flickr.com c BY addedentry flickr.com c BY SA Stëve flickr.com c BY NC ND Prahbu B flickr.com c BY NC ND The First World War Poetry Digital Archive University of Oxford ( The Imperial War Museum The First World War Poetry Digital Archive University of Oxford ( The Imperial War Museum The First World War Poetry Digital Archive University of Oxford ( The Imperial War Museum The First World War Poetry Digital Archive University of Oxford ( The Imperial War Museum TANAKA Juuyoh flickr.com c BY Quinet flickr.com c BY Dave Baker c BY NC SA Minneapolis Institute of Arts flickr.com c BY NC SA Dave Baker c BY NC SA
57 Dave Baker c BY NC SA Dave Baker c BY NC SA Thaddaus Zotlowski flickr.com c BY NC SA Dave Baker c BY NC SA Dave Baker BY NC SA Dave Baker c BY NC SA Professor Ralph Weiss UCL Peter Krogh The DAM Book Mag3737 flickr.com c BY NC SA Dave Baker c BY NC SA docman flickr.com c BY NC Dave Baker BY NC SA Dave Baker c BY NC SA
58
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