ChickPea, thanks a lot ! I'll look into it and try it. I'll see if it floats my boat.

@ GamerPrinter : I work with PS. I can see what you mean and it might be the method to go, thanks. I know that placing individual tree on such a huge scale is way more efficient than using groups of trees but it was my first try and I guess that what I lost in efficiency and time I gained in precision and I think my forests are more organic that way. But I keep the group method in mind, it will help me a great deal on the next map !

To finish, I'll roughly quote the god I was trying to summon (it was Max that has produced wonderful maps with individual trees ... numerous ones). Betraying his words but not his thoughts, here's the quote : "Get down to it you lazy bastard and draw each and every one of these trees by hand !"

I dunno what you think of it but my respect for him gained one level and it's no small feat ...