User blog comment:PlasmoidThunder/The Handy-Dandy, Fancy-Dancy Super Animation Ripping Tutorial!/@comment-11619185-20140904191618/@comment-3495717-20140905074115

Adobe ID is just a fancy term for an Adobe account. You get one like you would on any other site - through free registration.

I hate GIMP with a passion :P In all seriousness, it messes up the palette for some reason, and while it can import multiple images as layers of a single document, I'm not sure how one would easily accomplish the background removal. GIMP has command line batch functions, does it not? If one were able to replicate my Photoshop action using GIMP's batch function, then it might be an alternative, but even then, there's still that palette problem.