[Skunkmeister]

the NGNB map is built all in photoshop.

No it wasnt.

I use Gimp to make alot of the first map files. Photoshop doesnt handle grayscale very well, so the map_h and map_t are generated with Gimp.

Gimp however does not manage large files well, so the Map_C has to be made and managed with Photoshop.