1) Use Irfanview and decrease the number of colors.
2) Uff, i think you can make it like you want, in black/white or in another palette, you can also do it with the NLZ GBA, where you can choose the correctly worldmap palette, so its usefull to take this...
Hi Haefele! Really nice tutorial on the World Map editing.
I just have 2 questions, if it's not too much trouble.
1) I try importing my correct size PNGs in Unlz but it says that I need to index them. How do I do this?
2) When I change world maps, do I keep the greyscale (black and white) or can I change it to color and then import that?