You do not say whether the originals are in JPG formst or in RAW format. If the latter, they contain a lot of information that can be safely discarded (it is used for photo-processing which - in re-compressing - you have decided to forgo.
If your originals are JPG files, the re-compression is just that. Now, a JPG compression on JPG compression adds more artefacts, depending on what has been photographed. And, you will not be able to enlarge and print anything really huge. C'est touts. M ---MAV m...@bard.org.il On Wed, Jun 20, 2012 at 6:13 AM, Amos Shapira <amos.shap...@gmail.com>wrote: > Hi, > > I'm preparing a disk-on-key with family photos to send to my mum and > noticed something a bit unexpected. > Most of the photos were taken with a Canon EOS 300D, maximum resolution > and minimum compression. > Some were taken with Android phone and iPhone 4. > I use Digikam on Debian to manage my photos. > The total space of the original images (including movies, which weren't > touched) was ~7.6Gb. > The total space after re-compression using default parameters (75%, JPEG, > no resizing) - < 1Gb. > > I think I saw before that simple re-compression saves a lot of disk space, > but this is about 90% reduction (take into account that this includes > copied untouched .mp4 movie files). > From eye-balling the images on the computer screen (24", 1920x1280) they > look just fine. They are going to be printed on regular sized photo paper, > not made into bus-stop posters or anything. > > Am I missing something? Should I still send the larger images (I think I > can just barely fit them into an old 8Gb disk-on-key) or will the smaller > ones do fine? > > It also makes me wonder about my own photo stash - it takes a few dozens > of Gb's now. If I can recompress them without losing noticeable quality > (assume I never intend to display/print them larger than an A4 page) then > this could save me a huge amount of disk (+backups, handling, easier > shipping to relatives on the other side of the world etc). > > Thanks, > > --Amos > -- > [image: View my profile on LinkedIn] > <http://www.linkedin.com/in/gliderflyer> > > > _______________________________________________ > Linux-il mailing list > Linux-il@cs.huji.ac.il > http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il > >
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