Hi,
I’m experimenting with the Displacement Mod and HeightMaps. I have creat a HeightMap in Photoshop (with clouds filterfor the mountains). But I also want some hills. So I uses my soft bursh in gray and painted on black, but I got annyoing rings. How can I fix this?
I changed the NonColor to sRGB and it looks a bit better, but then, my mountans are too pointed.
HELP 
Hi,
It looks like you are using a .png for your displacement, Is it a 16bit or 8bit .png?
You may have better/smoother results with something like a 32bit .EXR
Hope that helps.
Guessing you’re using the “experimental” adaptive subdivision?
That does not need a displacement modifier - just the material settings:
Couple of things to improve quality of displacement map…
Use 32-bit Float
Shade smooth:
… you still want to stick with “non-color” data:
No rings:
Good luck.
Yes, it was 8bit. I Changed to 32 bit and *.exr but the resoult is like the sRGB (pointed mountains).
I also tried the expermimental + Sub. But this looks odd.
In both situations, the rings are still there 
(yes, I shaded Smooth)
When you say you changed it, did you redo it?
8 bit to 32 bit conversion will still be 8bit in 32bit space, try a blur or gausian blur or redo in full 32bit with a paint program.
Use EXR 32 bits and also check your scale and your transformations.
Where did you make those displacement maps? Blender or substance or Zbrush ?
This was a good hint. I added a Gaussian Filter (with 4), but now it looks like wax.
Maybe it will be helpful to share my file
I think you need to redo yr Heightmap in full 32bit.
You need to have more information in yr noise.
Heres a musgrave texture, set to displace, see the difference?
I think I found my problem.
I started a new HeightMap in Photoshop in 32bit. Last step was the Gaussian filter. That’s the result:
Then I undo the Gaussian and got this result:
It looks so much better, also no rings, but in the 8 bit, the mountains look a bit more realistic (in the sharpness)
Side question:
Can I bake/ save/ export or something else my displacement as a match for sculping?
Also, be sure to use .5 as a Standard value for no movement and white values to pop it out
