You don't have a photo editing program on your computer that will do it for you? You could then reload the pics.
There's a photo editing area on the imageshack site but I have not been able to find it yet. And I linked the photos from my smartphone so my computer was not involved in the process. Also, its a Chromebook so I don't think I can download a full on photo editing app.. Maybe a beta application may work.
"You failed if you didn't succeed, but you're a failure if you never tried"