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I'm trying to render an image with an output that is the pure diffuse colour only. In earlier versions of Blender I would have just used the internal renderer and created emission materials. But, in 2.8 with Cycles or Eevee, there is always a slight noise on the image.

In the viewport with viewport shading, it gives the result I'm after. Viewport Screenshot

With the default Eevee samples I get this result with soft edges and a noise in the flat colours. Eevee Render Default Samples

If I set Eevee's samples to 1 I get clean edges, but still a subtle noise in the flat colours. Eevee 1 Sample

I know the noise is very subtle, but I need it to be a solid colour. I was hoping I could use the compositor to get just the diffuse, but I couldn't figure out how. I still ended up with the noise in the result.

Thanks for your help Dan

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    $\begingroup$ If you want flat uniform colors perhaps the workbench engine is more suitable for this task? Otherwise set the Filter Size to zero in Render Properties > Film, disable dithering in Output Properties > Post Processing and save the image in a format that supports lossless compression (to avoid compression artifacts). $\endgroup$
    – Robert Gützkow ♦
    Dec 11, 2019 at 11:14
  • $\begingroup$ @RobertGützkow Yes, it was the post processing dithering that was the issue. Thanks for your input. $\endgroup$
    – DanMarionette
    Dec 11, 2019 at 11:27

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Hello and welcome bro!

I suppose the thing is post processing noise dither from Properties > Output

  1. Dither intensity = 1: Dither intensity = 1

  2. Dither intensity = 0: Dither intensity = 0

  3. Dither intensity = 2: Dither intensity = 2:

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  • $\begingroup$ This is spot on. I thought I was going mad. What was really throwing me is that if you right click on the rendered result to sample the image colours, they don't change across the noise! If I saved it, however, and sampled the colours in an external app it showed the different colours. Anyway, thanks for your help and thank you for the kind welcome. $\endgroup$
    – DanMarionette
    Dec 11, 2019 at 11:26

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