scanning & conversion bulk work on ordinary printing special efforts on manuscripts conversion...
Post on 20-Dec-2015
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Scanning & conversion
Bulk work on ordinary printing
Special efforts on manuscripts
Conversion of art works
Non-visual material
Modern printing
Sheet-fed vs. flatbed vs. look-down vs. digital cameras
A. Sheet-fed is fast, but requires unbinding the book.
B. Flatbed is slow, may break binding, but the scanner is really cheap.
C. Look-down scanners rare: Minolta PS3000. Expensive, good quality, so far no color.
D. Digital cameras on copystands: cheap, good quality, some assembly required
Too much of the money goes to quality control.
Cost of scanning
You can get about 200-300 hand-driven exposures per hour on a Minolta PS3000.
Sheet fed systems can do 5-6 books an hour if they don’t jam.
Microfilm scanners can do 2 pages/second (and the pages can’t get out of order.
Typical numbers are 10 cents/page up to 25 cents/page.
Can you do OCR?
London paper, 1728. Rotten letters.
Comparison of resolutions
600, 150, and 100 dpi. (Original in small print).
Value of grey scale
Grey scale adds legibility (antialiases).
Recently reannounced with great commercial hype.
OCR again
Humphrey accused.@of making more feathers fly
BARELY a fortnight after being cleared by John Major of kflling four robin chicks that were nesting in a windowboxoutside the Cabinet room, Humphrey the ...
Resolution
Michael Ester’s work: 1000x1000 good enough
Special Materials
Electronic Beowulf (www.uky.edu/~kiernan)
Undoing erasures
Importance of color imaging on black ink
Special illumination
Here: backlight; also low-incidence, UV, IR.
ConclusionsText scanning is now a commodity. So is slide scanning for art. Sound conversion is easy but not standard, nor is video. The entertainment industry is driving the technology; libraries tag along.
What you have to choose is the balance between cost and result. Perfection is impossible and near-perfection can be too costly; a sloppy job might not get used at all. But remember Voltaire:
“The best is the enemy of the good”.