A simple thing to do would be to run EXIFTool on both the original  
image files and the ones that had been opened by Photoshop, see what  
had changed.

I am sure that Photoshop wouldn't change the actual JPEG data but  
some change to the metadata isn't hard to imagine.

Godfrey

2008/2/9, Derby Chang <[EMAIL PROTECTED]>:
> Sort of OT, but this puzzles me.
>
> My friend as a little Canon P&S. She recently took a few pics that she
> wanted to print straight away. So she pulled the card out, opened a  
> few
> of the pics from the card (knowing she shouldn't do this, but she  
> was in
> a rush) in Photoshop, and printed them. Didn't save, and the Date/Time
> Modified of the files on the card are still the same as the Create  
> Date.
> But sticking the card back into the Canon, she gets an "Unrecognized
> file format" error on just the JPGs she opened.
>
> We copied the files back onto her laptop, and the JPGs are fine.  
> What's
> going on there?

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