Using the media management system JSTOR Forum (formerly Shared Shelf), you can upload files, add descriptive data, and publish them to your Omeka site. (This is not a guide to using Forum. For that, see the Forum support site.)
Note: The website Explore Fisher was created using JSTOR Forum with Omeka Classic, hosted on a local server. For information on Omeka-hosted sites, see omeka.net. For information on the new Omeka S, see omeka.org.
If your institution or department already uses JSTOR Forum, you can add your images to its collections or make use of images already in the collection.
You can easily add files and edit metadata in JSTOR Forum using different workflows. For example, you can edit the same field in multiple records at once. (Omeka does not allow you to do this, as of this writing, without uploading a CSV file.)
Forum support has recently added clear and detailed instructions for setting up Omeka as a publishing target.