The TFAO Digital Library
Content and paper-printed book equivalence
The TFAO Digital Library in June 2007 contained:
Content
Resources for Collectors and Students of Art History
Studies:
Equivalents
According to an undated lecture outline for SIMS 202:Information Organization and Retrieval, presented by Ray Larson and Marti Hearst of the School of Information Management and Systems at the University of California-Berkeley, one sheet of paper holds 5KB and a typical book contains 1 MB of information. This equates to a 200 page book. According to a January 2003 article in +Plus magazine titled "Text, Bytes and Videotape" by Oliver Johnson, a Fellow of Christ's College, Cambridge, "A page of a book (with 50 characters per line, 50 lines per page) takes 2,500 bytes, so a 400 page book takes 1,000,000 bytes." Mark Kochanski of the Computing and Software Systems department at University of Washington-Bothell states that there are 300 pages in an average book using 1MB, suggesting about 3.33 KB per page. With a range of 2.5KB to 5KB per page, an average could be about 3.75KB per page. [2]
According to a recent file inventory,
1,002MB of data equals about 1,002,000KB. If an average TFAO-dl .jpg image contains 36KB, [3] then 19,298 images take about 698MB of disc storage. 1,002MB - 698MB = 304MB remaining for text.
Using the average of the above academic opinions of 1MB per paper-printed equivalent book, the book content of TFAO-dl is 304 books plus about 63 images per book. [4]
Notes:
1. Many TFAO-dl text pages are equivalent to numerous pages in a paper-printed publication due to the ability of Web readers to scroll down Resource Library pages of various lengths. Using the above academic estimates, 249 books x 300 average paper pages per book = 75,000 equivalent book pages divided by 5,010 text .htm pages = 15 paper pages per TFAO-dl page.
2. a fourth estimate by another scholar was .5MB per book
3. this is a TFAO estimate derived by 19,298 total images with 3,122 cm series images @ 120KB per file and the remainder 16176 images comprised of am series and other miscellaneous images @ 20KB per file = 698MB / 19,298 = 36,170KB per image.
4. Reducing the book size to resemble more closely the size of hypothetical paper-printed art publications:
rev. 6/20/07
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