Hi,
i made a little tool in C, which helps a little with map_t creation.
I hope i didn't make something what was already made...
Most of you probably makes map_t in gimp or photoshop and have stuff divided into layers,
but there is a problem if you change map_t in FMB, everything is merged into single map_t file and goodbye layers....
What i made, takes map_t and divides it into layers. Basically you take map_t.tga, save it as uncopressed bmp image and run my tool with that bmp image.
After a few seconds you'll get multiple bmp files.
One of them contains only roads, another only rails and another contains highways.
You'll also get 32 files, each of them contains only corresponding textures and one file with all textures, but no roads, railroads or highways.
In these files, there is black color where si nothing and corresponding map_t value of grey if there is something, so if you add all files (without textures.bmp) together, you'll get original map_t
You can then use these files to reconstruct your layers in gimp, photoshop, etc... after you made changes in FMB.
download here:
http://www.mediafire.com/?jzewsd6719xisd4
here is sample, notice file names.

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ImageShack.usIm not making a map at the moment, so i used sinai map as a sample.
Sorry, but i don't know how to turn tga file and turn it directly into layered .psd or .xcf file, if i could, i would

If somebody know how to make drag&drop working, i won't mind if share it with me :-)