final output problem?

[jackieteh]

Hi,

May I know how to solve these artifacts on my final render? never facing this before...

[caypiranha]

where are artifacts being encountered? Not very obvious what you actually mean. The black lines? Its a bit to abstract - at least to me.

[Joelaff]

Or the posterization (banding) in the ceiling? In that case you need to add noise. You can try to save in a higher bit depth format (32bit float like EXR, or 16bit PNG), but you pretty much need to add noise to get rid of it.

[jackieteh]

where are artifacts being encountered? Not very obvious what you actually mean. The black lines? Its a bit to abstract - at least to me.

The posterization in the ceiling

[jackieteh]

Or the posterization (banding) in the ceiling? In that case you need to add noise. You can try to save in a higher bit depth format (32bit float like EXR, or 16bit PNG), but you pretty much need to add noise to get rid of it.

add noise? yes, this images I save in tiff 16 bits

[Joelaff]

Noise/grain is pretty much the only solution to banding. The posterization can occur at many different levels-- in the file format (unlikely at 16bit) in the display, in the display LUT, etc. Noise/dithering is really the only way to hide it. If you are using a denoiser, perhaps don't... or add noise back in.