Remove Black Image Background

I have a single JPEG where the artwork is already outlined; the only thing left is to strip away the solid black background so the outline sits on full transparency. I’ll be printing the graphic on a T-shirt, so the cleaned file must keep the existing edge quality crisp and free of jagged halos.

Please return the finished image as a high-resolution PNG (a JPG copy is welcome too) with transparency verified. No colour shifts or compression artifacts—just the exact outline I supplied, floating on a transparent canvas, ready for print.