1. One or more computer storage media having stored thereon multiple instructions that, when executed by one or more processors, cause the one or more processors to: receive a global tag for an image, the global tag identifying one or more objects in the image; receive a region-specific tag for the image, the region-specific tag identifying one or more objects in a region of the image; store the global tag and the region-specific tag with the image; and display, along with the image, an identifier for each of the one or more objects identified in the global tag, and an identifier for each of the one or more objects identified in the region-specific tag.