import -l filename.png
-l switch is used with the import .png command to import the cart label.
If you ever saw some great looking cover art for game carts and wondered how they did it, an easy way is to capture a screenshot label of your game using F7 (or ctrl/cmd + 7), then export the label as a 128x128 png image, then edit in an external program, then import your new label.
Edit Labels in an External Editor
6 May 2023