So I decided to merge original WorldMap by myself, because those 250x250 image blocks that comes with Arcanum are pretty useless for textures (non power of two = waste of space).
There is also DDS texture of World Map I made for use in OpenArcanum. Its compressed by "The Compressonator" tool, so its pretty good quality (DXT1c compression).
I'm going to release it here, so nobody else need do that dirty job ever again...
Download (10MB): (Including original WorldMap image in PNG format + texture)
Enhanced/Original - It doesn't look only more yellowish, does it?!