Store author information along with the images in the gallery.
ONE FILE ON GALLERYMODULES.COM IS OUTDATED.
Replace author_block.php with floridave's correction
Will maintain a sense of the original author of images, as opposed to the owning user in the system. If an uploaded image contains author information in any of the metadata blocks (Xmp.dc.creator, Iptc.Application2.Byline or Exif.Image.Artist), it'll use that. If it doesn't, it'll impose the name of the current user as the author of the image.
This author information is written to the Xmp, IPTC and EXIF blocks for the uploaded image, its resize image and thumbnail image. It can also (optionally) write the IPTC Credit field and XMP Usage Terms.
Note: You'll need the exiv2 utility installed. Tested versions include 0.16 (current Debian stable) and 0.20 (current release).
NOTE: Has been found to break all dynamic modules, like tag_albums, search, etc.
Edit author/usage_terms and/or author/credit in the advanced settings to have the module tag those fields.