The palette browser allows you to choose from the available 16-color palettes, and shows a preview of the current sprite in each palette.

Use the Up and Down arrow keys (or PgUp, PgDn, Home, and End) to navigate the list, or type a palette number.

Press ENTER or SPACE to choose a palette.

Press Ctrl+C or Alt+C to copy a palette, and Ctrl+V or Alt+V to paste.
