How could I make a curvilinear perspective with Gimp? I've found out making a linear perspective, but not curvilinear.
My guess was that there were any way to move the single points in the grid, and not just the endpoints.
I've found a tool in Gimp 2.8 (transform grid), that has helped me to do what I wanted. Look at this example:
In this way, you could achieve giving perspective to linear images.