Phatch

[2] Phatch can also be used to rename or copy image files based on the Exif or IPTC Information Interchange Model tags.

The tabs can be passed to any action, which is especially useful for renaming or copying files, but also for data-stamping such as date, time, aperture or shutter speed on the picture.

Phatch does not provide a live preview of the image manipulation and has no built in support for remote file systems.

Softpedia's editor's review of Phatch 0.0.bzr157 overall awarded 4 stars, highlighting the clean and simple interface, program stability, and batch processing actions.

Allowing the user to use Python to create additional batch process was also seen as an advantage over similar products.

[4] It was the opinion of Linux Pratique magazine that Phatch 0.1.3 filled the gap between GIMP and Imagemagick, with a user-friendly interface saving a lot of time for batch processing.

Phatch includes tools for rounded corners, reflection, and perspective as shown in this thumbnail.
Dialog to add Phatch actions
Exploring Exif tags in Phatch
Phatch interactive Python shell