Boats are a compression problem dressed up as a photography problem. A hull shot is one huge smooth gradient of gelcoat — which compresses beautifully and hides damage well — wrapped around a band of brutal high-frequency detail: teak caulking, stainless fittings, cleats, winches, rigging wire, the stitching on a bimini. A blunt quality drop eats the smooth gradient first because it is cheap to throw away, then starts chewing the hardware, and a boat that reads as well-maintained in the original starts reading as tired. Buyers zoom on exactly that hardware band to judge how the boat has been kept, so it is the wrong thing to lose. The documented targets help: Boats Group wants 2160x1440 at 3:2, 1080x720 minimum, 15 MB per photo and 50 MB per listing combined. A 2160x1440 JPEG at a few MB per file, stepped down gradually rather than slammed, keeps the hardware crisp and still fits 30-plus photos in the cap. Skwish resizes and compresses in the browser with a per-file readout and a batch queue, so you can compare the deck hardware at 100% before committing the setting to a whole set. Nothing is uploaded.