My very dear friend Raelene sent me a file this morning that wouldn’t open on her Mac.  She was getting this annoying error:

“Could not complete your request because and unknown or invalid JPEG marker type is found.”

I’d love to blame this on her Mac, but no, this is not a platform-related problem.  It can happen to any Jpeg file, any time. Sure enough, when I tried to open it on my PC, Photoshop gave me the same error:

Could not complete your request because and unknown or invalid JPEG marker type is found.

I don’t profess to know what causes this.  It’s some kind of corruption in Jpeg files.  Thankfully, it’s not very common.  And thankfully, it’s sometimes easy to overcome (not always).

First, I checked the file size.  If a Jpeg file is really badly corrupted, it will sometimes be really tiny – only a few kilobytes.  If I ever see that, my heart drops, because the chances of recovery are poor.  But this file was seventeen megabytes – plenty big enough to give me hope.


And the fact that Windows was able to show me a preview of the photo also made me confident.

The trick is simple. Open the file with the dumbest photo software you own.  If you paid even a dollar for the program, it won’t work.  It has to be utterly uncomplicated.  For some reason, clever software like Photoshop is too clever for its own good.

So I chose Paint:


And sure enough, it opened just fine!  In Paint, I was able to save it as a new file name, then everything was rosy.  Photoshop was able to open the new file just fine.  The only problem was that the image was untagged (no color space), which I addressed this way.

(By the way, when I re-saved the file from Paint, I chose TIFF as the file format, rather than Jpeg again.  This might have been unnecessary, but I don’t trust the compression that dumb programs like Paint apply to photos.  It might have caused too much damage.  Choosing TIFF was a safe option.)

The above “dumb software” method has worked for me lots and lots of times in the past.  I hope it works for you too.


  • Mac peeps, if your computer doesn’t have any software dumb enough, send the file to a friend with a PC, and ask them to try Paint.
  • PC peeps, if Paint doesn’t work, see what else you’ve got.  One of those programs that appear in your “Edit with” menu might work.
  • On more than one occasion, I’ve been able to view a photo in a dumb program, but still couldn’t save it.  Out of utter desperation, I have taken a series of screenshots of the image in the viewing program, then assembled them together in Photoshop.  Desperate times call for desperate measures, right?