Saving 48bit colour to jpeg ?

Discussion in 'UK Photography' started by Andy, Aug 19, 2003.

  1. Andy

    Andy Guest

    Can i save a scanned image to jpeg at 48bit colour depth ?, the reason i ask
    this is that i have just bought a scanner (PB Diamond 1200 Plus) and it says
    it will scan at 48bit colour, however, that option is greyed out when i
    scan. The only way i can get it to scan at 48bit colour is to scan from
    within Adobe Photoshop 7, but then i can only save to RAW or .TIFF (not
    jpeg) ?

    Cheers for any info here.

    Andy, Aug 19, 2003
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  2. Andy

    The Reid Guest

    Following up to Andy
    Yes, you will also find many actions within photoshop cannot be
    carried out at 48 bit. You can make a TIFF, adjust the colours
    etc and save it, then make a jpeg from that file, but not at 48
    Mike Reid
    "Art is the lie that reveals the truth" P.Picasso
    UK walking "" <-- you can email [email protected] this site
    (The reply-to address is a spam trap)
    Spain,cuisines and walking ""
    The Reid, Aug 19, 2003
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  3. Andy

    Andy Guest

    Ahh, i see. I hadn't really thought about jpeg being, as you mentioned,
    'lossy'. You're right. Thanks
    Andy, Aug 19, 2003
  4. Some scanners work with more than 8 bits/channel internally, but the software
    supplied with them doesn't make this externally available. There is a very
    good shareware scanning program called Vuescan from which can
    extract 16 bit/channel signals from many popular scanners. (Not all 16 bits
    contain valid information, but 16 bits is the standard file format).

    I don't think you can save a 16 bit JPEG though. I think it will have to be a
    bitmap format such as BMP or TIF.

    Roderick Stewart, Aug 19, 2003
  5. I tried it and abandoned it as I found it a right b*****d to use. The
    software bundled with my Minolta Dual Scan III might not be the last word
    in scanning excellence but at least it's easy to use and gives me good
    Julian Barkway, Aug 20, 2003
  6. Andy

    Tony H Guest

    I believe JPEG 2000 will save 48 bit files, and there are freely
    available add-ons available for PhotoShop that will enable reading and
    writing of the JPEG 2000 format.


    Note: Don't bother using my email address - it's a spoof to avoid spam.
    Tony H, Aug 22, 2003
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