Extracting landmass from PNG.

I was reading another post on here and sadly I did not understand so I'm hoping I can get a little more instruction. So I have a PNG of a map I made it has two colours the landmass and the 'ocean'. I read there's a command that helps the programme figure out the landmass by the colours. Could someone explain to a newish user how to do this. This other map I've spent a lot of time on but it was in a free simple software so I want to upgrade it to the snazzy Cc3+. Thanks for any help.

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