Galaxy S3 Photos corrupted

A

AC Question

hi,
about 100 of my photos have been corrupted. The photo icons are still there in the directory but all are just 32KB size and can't be opened with the phone (from either the camera function or the File browse function). All other photos are fine.

When I open them on the phone I just get a grey broken picture icon (white head on grey background with lightning flash in top right corner - which I guess means broken picture file?)
When I try to open them on Windows Photo Viewer on a PC, I just get a colour block instead of the photo, but the photo loads for a fraction of a second before being covered up by colour block.
Can I recover them?
Thanks