Skylum has officially announced the upcoming release of Luminar 4—the next generation of their increasingly popular photo editor—by showing off a new AI-powered editing tool that will be available only to Luminar 4 users: AI Sky Replacement. Skylum claims Luminar 4 will be the first photo editor to have a fully automated Sky Replacement tool—and when they say fully-automated, they’re not joking. This tool doesn’t just automatically mask out your sky and drop in a new one, it reportedly goes…