True displacement mid level value I'm trying to use the Experimental True Displacement feature, but it seems that a grey value of .5 is not the default mid level?

I tried using a gradient map and also generated a displacement map for a little indent on a wall, But my results are that the wall in it's entirety gets displaced and puffs up.

Am I missing something? Is there a setting somewhere where I can pick the desired midlevel? Or can somebody tell me what color value can be used for zero displacement?

Thank you!
Ok silly me,

It seems that the color black is used for zero displacement. So you have to use a math node on your height map to generate negative displacement with negative color values.