I would like to report an issue with the "Change Background" tool. When using it on a perfectly cut-out image (in my case: a product photo of a dark glass bottle), I noticed that the automatic background selection leaves a (slightly irregular) margin of a few pixels around the main object. As a result, the final image with the generated background (I tried several times) displays an unwanted halo around the cut-out object. It would be helpful to have an option to adjust or refine the automatic selection, as it is not always perfect.