Once installed you need to download BIMP, the Batch Image Manipulation Plugin, and install it (see Wikibooks GIMP/Installing Plugins for the details). Installing GIMP is fast and painless so I won’t belabor it here. GIMP, a free, open source image editor, that’s available for Windows, OS X, Ubuntu, Debian, openSUSE, Fedora, Mandriva, BSD, and Solaris and one of its neat features is an automation plugin called BIMP (though you can also automate GIMP with Python which, like GIMP’s batch mode, is not for beginners). Then I remembered GIMP, the GNU Image Manipulation Program. Another constraint (other than my reluctance to wrangle Photoshop) was the need to be able to do this in the future as part of a process to be built into a virtual machine running Linux. I know you can automate Photoshop but that’s like getting into a Sherman tank to go shopping at your local supermarket. Krita is an open-source photo editing software that offers great functionality for drawing and processing bitmap images. For a project I was recently working on I needed to remove the white background from several hundred images in PNG format and replace it with transparency.

Gimp image editing