jpg quality when archiving?

Discussion in 'Digital Photography' started by 86047, Jan 21, 2007.

  1. 86047 macrumors regular

    Oct 7, 2006
    when jpegs are archived into zip or whatever in panther and later's "archive" feature,
    do they lose quality?

    If they are compressed (archived) and then uncompressed (eg. by stuffit expander), is the quality the same as the original? Is it lossless compression?

    Thanks just trying to free up disk space on my relatively small ibook drive (some old images)
  2. Blue Velvet Moderator emeritus

    Jul 4, 2004
    Zipped files are lossless although I'm not sure what kind of compression gain you would get from zipping up JPGs, if any at all.
  3. dllavaneras macrumors 68000


    Feb 12, 2005
    Caracas, Venezuela
    I've tried to compress jpegs by zipping them but the file size is not that much smaller than the original folder...
  4. ChrisA macrumors G4

    Jan 5, 2006
    Redondo Beach, California
    You can't compress a JPG image. OK you can try but the result will be like maybe 98% or the original size. Loss-less compress is called "loss-less" becase nothing is lost during compression. So don't worry about loosing quality but it's pointless so don't bother.

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