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How to reduce grain in render

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I am rendering an image that takes about an hour and a half on a Imac 2017 and it has more grain than I would like (see attachment). How would I improve this without significantly increasing render time?

My current Mantra render settings are:

Mantra tile size 48

Reflection limit 4

Refraction limit 4

Diffuse limit 0

Color limit 3

Ray tracing Bias 0.001

Sampling pixel sample 5x5

Gamma 2.2

Min ray samples 2

max ray samples 8

noise level 0.001

Global quality 2

Diffuse quality 1

Render 16 bit integer Tiff with gamma 2.2, 2500x2000 px



Edited by Isleofgough

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