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EVERY page? That could finally solve all my hard drive space problem. Store the images on a photocopier!

• e1ven 17y ago
  20GB Hard Drive (Cheap) / 100KB / Jpg stored = 200,000 pages. Effectively infinite, when considering the copier lifetime. Certainly falls within most people's definition of Every.
  • CWuestefeld 17y ago
    At 300dpi (which is pretty minimally low), an 8.5x11 image is 8.4 Mpixels. At any decent compression, that's going to be more like 1MB/page, or 20,000 pages. Maybe we're talking monochrome? That reduces image size, but I'm not sure how to calculate that.
    • e1ven 17y ago
      Don't worry, it's not "every" page like the journalist sId, it's only the last 20,000. Somehow, I don't think that will make anyone feel better. It's "every" by any normal definition, particularly in this context.
      • whatusername 17y ago
        So the answer is to have the work-experience kid press the copy/scan button 20,000 times! :P
    • Kadin 17y ago
      Well, monochrome is 1bpp, so it makes the raw image about 8Mbit or 1MB. The rest you'd only be able to determine empirically, and it depends quite a bit on what you're scanning and the scan quality. "Noisy" images, including poor-quality scans or scans of halftones, don't compress well, but a crisp scan of high-contrast text or line art will be a fraction of that 1MB even with a trivial compression scheme like RLE. If you store as a TIFF with LZW, or something proprietary but similar to that, you're probably talking about an average of 200kB or less for a high-resolution scan. And this is assuming a fairly generous size/speed tradeoff, since you have a local hard drive to burn. I've seen huge document archives that go the other way (scan at lower resolutions, compress hard) that average 30-50kB/page.
  • oiuytfgvbhjnk 17y ago
    They don't compress the images - they are written as essentially bitmaps from the scanning engine then read back to the printing engine. Most actually record 8bits/pixel even in mono because it lets you do lighter/darker and background level in software. so a typical page at 300dpi is something like 100sq in * 90000 pixels = 9Mb
    • Groxx 17y ago
      Have a reference? (boy, I'd hate to have to type that name to log in...)
      • euccastro 17y ago
        Not that hard on a qwerty keyboard. Try it.