Help with making maps

[Warlord]

Hi, can anybody help me with making maps, please?

The problem is the next: I knew how to make maps, but now i try to make one but when i want to test it it doesn't open and a warning says me "error opening file" -_-"

Can anybody remind me the things required to make a map work correctly?

i used to put "save for web" in the photoshop, but now it doesn't work D:, and i don't know what i have to configure D:


ty D;

[angus]

put 8 bit and less than 260 color

[Husk]

good article on wkb: Colour map