Both: Third base!

it works by drawing ghosts in color pixels with zero alpha, which show up in some previews but get ignored by others. two people can look at the same image and see different things!

I made a Haunted Camera tool for a game jam once that adds ghosts into screenshots that only show up in certain previews

inspired by the time I imported a png of a polaroid frame into my game, only to find it was a photo of an old prosthetic leg in engine

calamitynolan.itch.io/haunted-camera