Heightmap - Question about Level Correction setup

Hi everyone,

I have a quick question about how to properly setup the Export Heightmaps settings, especially the Levels correction. I let the default parameters but all my images are very (very) dark despite the very hight and peaky mountains I painted in the new Terrain of Unity. So I can't have a correct height when I try to put the heightmap in Blender for instance. The displacement modifier just shows me a very flat terrain.

What is the unit of the min and max of the Levels Correction ? Are they a factor, brightness level? As we can go beyong this value, should I put a larger value (the Max?) to get brighter exports?



Thanks for any advice!