Is it a bug or my fault or the device?
iPad Pro 10,5” 256GB
Screenshot:
Rendering:
Gradients are not good.
Settings
Uploading: 19D6DF1B-5158-469D-B105-6CEFE39F3FF1.jpeg…
Material is PBR, no post processing. One light, but it’s same with light switched off. One of standard environment set to 0,76 intensity.
UVSphere standard.
I think the render output as 8bit PNG might be to blame, would be nice to have the option for 16bit TIFF render maybe?
Please read the Next Release Log 
(no need for tiff, png supports 16 bits as well)
Solution is:
Switch off “transparent background” in rendering dialogue. That’s where the bug is sitting.
I am sorry. Thank you.
Banding was missing in my vocabulary and I thought it was the ugly black border between transparency and coloured pixel meant, when I read the bug report those days.
I didn’t’ know that complete pictures with transparent background are effected and useless.
Thanks again -
banding = creating stripes / oh dear! 
