On 5/1/09 8:27 PM, Lars Aronsson wrote:
> Does anybody have a printed test sheet that we can scan or photo,
> and then compare the resulting digital images? It should have
> lines at various densities and areas of different colours, just
> like an old TV test image. Can you buy such calibration sheets?
archive.org scans typically include a color card target
image near the back (or front) of the book, e.g.
http://www-steve.us.archive.org/public/data/eg/birdsthateverych00doub/birdsthateverych00doub_jp2/birdsthateverych00doub_0371.jp2
typical specs for our scanning rig (scribe) are roughly:
1 8x8x5' scribe structure
2 Canon EOS 5Ds
2 light boxes
1 orthogonal glass platen and cradle
1 foot pedal, pulley system
Linux PC
LAMP stack
custom web-based UI
gphoto, imagemagick, leptonica, rsync
fast internet
we scan over 1,000 books a day with about 100 scribes like this.
[log in to unmask]
