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Thread: Converting jpg to dng for archival reasons - file integrity checking

  1. #1
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    Converting jpg to dng for archival reasons - file integrity checking

    I am just reading Victoria's latest book (p.117) where she talks about conversion of jpg to (lossy) dng to achieve a better possibility of file integrity checking.

    Having once lost 30,000 files through a corruption of the file system myself a long time ago (when HDDs were expensive and small..), I find this aspect worthy of some discussion.

    Has anyone done this in a systematic way and what has been your experience? Yes, it increase file size a little bit but for the sake of safety that should be a small price to pay.

    Any views?

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    I think it's a good use of DNG and I've been doing it for a long time. The only new detail is that this won't eat up so much disc space.

    My JPEGs come from a point and shoot, my iPad, and occasionally when I make a mistake with my DSLR or am forced to shoot JPEG because I'm close to filling my cards. Converting these files to DNG means it's very clear that these pictures are originals - not derivative JPEGs which I might generate for email, web etc. So it brings those ex-JPEG originals to the same status as the Nikon NEFs which I also convert to DNG.

    I see these as practical advantages. The file integrity checking is a theoretical benefit only. Without tools to validate an archive, it's not much value.

    John
    John Beardsworth - Photographing, Writing, Advising, Coding
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  3. #3
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    The file integrity checking is a theoretical benefit only. Without tools to validate an archive, it's not much value.
    Victoria talks about Image Verifier http://basepath.com/site/ to verify the checksums. I am just reading the software documentation.

  4. #4
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    After converting a jpg into a dng file, the preview of Mac OS Lion does no longer support this raw format. Is this normal or did I get some settings wrong?

  5. #5
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    No, it's expected at the moment. You're using the latest DNG spec, and CoreImage is a step or so behind.

    I'd forgotten that utility. From what I known of Marc, I've little doubt it will be good and reliable. So yes, maybe I should have said not "mainstream use" or not "built in".
    John Beardsworth - Photographing, Writing, Advising, Coding
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  6. #6
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    Ok, so it seems like a safe bet converting jpg to dng far archival reasons. Or has anybody experienced major issues while doing that?

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