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Banding Issue
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Description

System Information
Operating system: Windows 10 Home Single Language 64-bit
Graphics card: Nvidia Geforce GTX 850m

Blender Version
Broken: From Blender 2.79b release (Heavy Banding Issue)
(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
Worked: (optional)

Short description of error
Hello was rendering a mock-up scene and suddenly I found lot of banding issue, didn't happened with me.... :( even with 16 bit and 32 bit HDR, EXR output
Exact steps for others to reproduce the error

  1. Open Blender > Create simple scene with a plane and sphere and lit up with any light or HDRI file
  2. Render that scene If we render with 1000 sample there is noise and with 2000 or more samples there is banding issue banding is much more when we render using Filmic color management
  3. It feels dirty and actually it's dirty for our nice renders

Based on the default startup or an attached .blend file (as simple as possible).

Details

Type
Bug

Event Timeline

I don't see any substantial regression in 2.80 or 2.79b compared to 2.78.

You can reduce banding using Render tab -> Post Processing -> Dither

Brecht Van Lommel (brecht) claimed this task.

Right, dithering should be used to solve these kinds of issues. It is now enabled by default in 2.80 too.

Second, if you output HDR / EXR, it should be the application loading those images that applies the dithering, as the banding happens on the conversion to 8 bit.

Can you attach a PNG showing that problem? I have no problems here (2.79 and 2.80 no matter what version). I suspect it's an issue with your display driver (or its settings) or another piece of software that changes the display of images on your laptop.
Do the images @artem ivanov (ixd) posted look OK for you or do they also show banding?

Dithering is, afaik, only for 8-bit formats. When rendering out in 16 bit or higher, you may see banding, but that is due to the display, not the output file.

ahh! It solved as i increased samples and use dither (Didn't knew it exists in Blender)

Thank U ... Solved the issue... Actually, It should be enabled by default in the upcoming 2.8 version (as bracht said) even Cycles is same as Octane but Octane slightly adds dither to Image ..... BTW, These are results....

It is too late for this comment but I decided to check 32-bit .exr and yep, there is no banding there as expected