errya

Thanks for your help. It turned out to mainly be a layers issue, but there were a few holes which you advice was helpful to find

Hey guys, Just a quick question. I'm editing a map on paint.net which I drew on paper first and then scanned. I wanted to use the fill tool to make the ocean blue, but there must be near-invisible little gaps in most of my landmasses, since they turned blue too. I might be able to find them by trial and error/sealing off certain areas, but since my map is so big (almost 10000 x 10000 pixels) it takes literally 3 minutes for for it to fill. Does anyone know of a faster way to find these little pixel-wide gaps? Thanks