I am starting to design d&d battle maps for my own use(+ possibly for sale later on) and while I use roll20 for my games, if I decide to go for the sales option I know I will need to adjust it.
The problem is, I use the grid that comes directly from roll20, and have no idea how to apply a grid directly to my maps. I work in PS. I use the grid available in PS, but it overlays even over walls etc. and I would like to apply it only on the walking areas.
Any advice?