On Sat, Feb 19, 2005 at 12:23:08PM +1100, David Gerard wrote:
Ray Saintonge (saintonge@telus.net) [050219 11:22]:
David Gerard wrote:
An A4 page at 300dpi is 8.7 MB; at 600dpi it's 34.8 MB. How many pages are there? Time to buy a 1000-stack of DVD-Rs ;-)
The 1911EB has 29 volumes, of which the last is an index. Each volume has about 1,000 pages. Add three volumes for the supplements, and we have a mere 32,000 pages. David, was your estimate based on colour scanning? Wouldn't monochrome scanning take less space? There are very few colour pages.
Greyscale (one byte per pixel, 210 x 297 / 2.54 / 2.54 * 300 * 300 pixels). You could probably reduce it to four bits per pixel. I wouldn't suggest going to three. I did this last year scanning in a pile of stuff.
Why should it be kept uncompressed, or compressed by throwing away the lowest bits ? There are pretty good algorithms for compressing text, like djvu.
Anyway, the 32000 pages in 8-bpp 600 dpi take just about 1 terabyte. That's not much.