Apple’s Aperture application is an extremely versatile digital photography workflow tool. In Aperture, once an image has been imported into a project in the library, the original file, called a master, is never modified. As images are adjusted and edited, instead of the space-intensive duplicate-edit-save cycle of Photoshop and other tools, Aperture’s workflow stores changes as very small recipe files called versions. When a particular version of an image is displayed or exported, Aperture reads the master from disk and applies the recipe. Changes to a recipe can be made and unmade at any time and in any order, resulting in a non-linear, non-destructive and very flexible workflow.