Displacement/Height map question

[Athener]

Is there any specific format for the maps? Every height map I placed just inflate/shrink the object and tessellation does nothing :(

[KillThemAll]

Your geometry shoul be tessallated before, i mean it should nt have just 4 poligons. It shold have sertain amount of poligons to properly feed tessallation in displacement in toolbag. And also you should switch Subdivision: flat or pn triangles if model have low amount of poligons