A fast an versatile Image Viewer Presentation of Thomas Scheffler - - PowerPoint PPT Presentation

A fast an versatile Image Viewer

Presentation of Thomas Scheffler

Thüringer Universitäts- und Landesbibliothek Jena (ThULB)

Staff Mobility Week 2012 Bergen, 2012-05-08

1 Dienstag, 8. Mai 12

About me

• Thomas Scheffler
• 33 years old
• 2005 diploma in Computer Science at Jena University
• since 2003 member of MyCoRe
• since 2003 in ThULB IMS department
• UrMEL-Team

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Where I work

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Key features of an online image viewer

• display images
• display images fast
• orientation
• navigation

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display images

• Web browsers display different image file types

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Browser \ File types JPEG PNG GIF TIFF JPEG2000 Google Chrome Microsoft Internet Explorer Mozilla Firefox Opera Apple Safari Yes Yes Yes No No Yes Yes Yes Yes No Yes Yes Yes No No Yes Yes Yes No No Yes Yes Yes Yes Yes Browser \ File types JPEG PNG GIF major browsers Yes Yes Yes Browser \ File types JPEG major browsers Yes

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• Use TIFF for digitalisation and storage
• Transform images into JPEG for users

display images

• Web browsers display different image file types

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Browser \ File types JPEG TIFF JPEG2000 major browsers Yes No No preferred for long term preservation Browser \ File types JPEG major browsers Yes

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Key features of an online image viewer

• display images
• display images fast
• orientation
• navigation

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display images fast

• Size actually DOES matter
• How to present large images fast?
• Use different file type for presentation.

๏ Good point, compresses data without loosing much information

• Use higher compression.

๏ Lossy compression lets you loose so many details. ๏ Looks really ugly.

• Scale down to for instance to 100 dpi for presentation.

๏ Why scan at 600 dpi if you „loose“ so many details to the user?

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display images fast

• Present large images in different zoom levels.
• On smaller zoom level this decreases size of transmitted data.
• Quick view (Is that the right image?)

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display images fast

• Cut out image data.

๏ Only transmit data the user is actually going to see. ๏ Transmitted data does not depend on current

zoom level.

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display images fast

• Make tiles and assemble on client side
• Deliver image parts really quick
• Tiles are cacheable
• No computation on server side

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Key features of an online image viewer

• display images
• display images fast
• orientation
• navigation

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• rientation
• Highlight the cut out area.

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• rientation
• Provide scrollbars
• High demand by our users
• Users are used to the concept

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Key features of an online image viewer

• display images
• display images fast
• orientation
• navigation

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navigation

• Just consider navigation inside a set of associated images.
• For instance book pages:
• We have pages in books.

๏ They are usually ordered.

→ Lets number them: 1 ... n

๏ Some pages have a label.

→ Display and user can jump to the 14th page that is labeled „3“.

• Some books are structured in chapters and sections.

๏ „Pages“ are quite abstract. ๏ „First Act“ has more semantic than „3“.

• Does not rely mainly on books (e.g. box of photos)
• There is a standard that addresses this: METS
• maintained by Library of Congress
• XML
• supports ORDER, LABEL and LOGICAL STRUCTURE

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Some links

• Lecture of Martin Luther about the Galatians:

http://archive.thulb.uni-jena.de/hisbest/receive/HisBest_cbu_00005243

• Some maps (estate of Delbrück):

http://archive.thulb.uni-jena.de/hisbest/receive/HisBest_cbu_00011796

• METS Standard: http://www.loc.gov/standards/mets/
• Image format support:

http://en.wikipedia.org/wiki/ Comparison_of_web_browsers#Image_format_support

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Bibliotheca Electoralis 1502-1547

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Suggestions? Comments? Questions?

ThULB Jena Thomas Scheffler, UrMEL-Team Tel.: +49-3641-9-40027 Email: thomas.scheffler@uni-jena.de www.thulb.uni-jena.de

Finally, he finished his presentation

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