TimPollard
Level 1 (24 points)
Mac OS X

Q: Some jpegs reported as corrupted

Hi

 

Suddenly I find that my Mac is reporting that many of my images stored as jpegs are corrupted and can't be opened. Some of these apparently corrupted files will open in Photoshop CC but most won't. They are synced to a PC server which displays the ones reported as corrupted perfectly. Different copies of the same photo held in completely different folders exhibit the same problem. In any given folder some pics will open and some won't. The PC syncs the files to OneDrive and if I download a fresh local copy of an affected file from OneDrive it too won't open.

 

A second mac has the same problem with the same files.

 

I suspect as I have never had this problem before (and this workflow has been in place for several months) that it may be related to my recent upgrade to macOS Sierra. I have a third Mac which has not been upgraded and still uses El Capitan - with that one I can download a copy of an affected file and it opens just fine, or open a copy on the PC no problem. It will also open the copy stored on the Sierra mac fine.

 

So I think Sierra dislikes something about the tagging/encoding of some jpegs.

 

Can anyone shed any light on this please?

 

Thanks in advance for any ideas.

Mac Pro, macOS Sierra (10.12)

Posted on Sep 27, 2016 4:00 AM

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TimPollard

Q: Some jpegs reported as corrupted

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  • Helpful answers

  • by Njofrekk,

    Njofrekk Njofrekk Sep 27, 2016 4:04 AM in response to TimPollard
    Level 1 (50 points)
    iPhone
    Sep 27, 2016 4:04 AM in response to TimPollard

    If you suspect that Sierra is the culprit, try reinstalling it. If that doesn't help, revert back to El Capitan and see what happens.

    Good luck.

  • by Terence Devlin,

    Terence Devlin Terence Devlin Sep 27, 2016 4:06 AM in response to TimPollard
    Level 10 (139,562 points)
    iLife
    Sep 27, 2016 4:06 AM in response to TimPollard

    If they've been on a PC server they sometimes lose their suffix and become a kind of exe file to the Mac. Try manually add .jpg to one or two and see if that helps.

  • by TimPollard,

    TimPollard TimPollard Sep 27, 2016 6:57 AM in response to Terence Devlin
    Level 1 (24 points)
    Mac OS X
    Sep 27, 2016 6:57 AM in response to Terence Devlin

    Thanks for the ideas

     

    I don't think reinstalling Sierra is going to be good use of time given that the problem identically affects two different Macs with Sierra. And I know El Cap doesn't have this problem because of the third Mac.

     

    I've tried renaming a file with a jpg suffix (which of course they already have in order to work on the pc), but that doesn't seem to help. The suffixes are all there on the dodgy files, but completely renaming doesn't seem to fix it.