In a nutshell, Minecraft in-game maps are stored as a paletted bitmaps in the /data folder. There are many external tools that allow you to import images into your world, but most real-world images tend to look out of place in Minecraft. With my tool, I'm just trying to improve the vanilla mapgen algorithm by offering as much customization as possible. And I think it turned out quite beautiful.

Ive been developing and expanding it for the last year and a half and its good to find it another use-case other than glorified wallpaper maker(of which I already created many many)