Printed test sheets:
At 04:54 PM 5/2/2009 -0700, st...@archive.org wrote:
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.
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
custom web-based UI
gphoto, imagemagick, leptonica, rsync
we scan over 1,000 books a day with about 100 scribes like this.