Prepare a sublimation design with a transparent background

Why the pale background still shows

A design saved on white looks perfectly clean against a white mug or shirt and then shows an obvious rectangle on ash, natural or beige. The fix is not to lighten the background: it is to remove it, so the blank shows through. Background removal here cuts the subject to real alpha in your browser and exports a PNG that carries the transparency with it.

Keep the resolution you started with

300 dpi at final size is the working rule, but the number that matters is the pixels you actually have. A 1000px graphic blown up to fill an 11in mug wrap is soft no matter what dpi the file claims. Start from the largest original you can get, and export without a resize step in between.

Where automatic removal earns its keep — and where it does not

Clean product shots, lettering, logos and illustrations cut out cleanly and instantly. Wispy hair against a cluttered background, and anything semi-transparent like glass or a veil, are the honest hard cases — the edge will need a pass with the brush. That touch-up is free and local too, so the only cost is a minute of your attention.