Render Clean Diffuse Colour Only Blender 2.81 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.


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


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


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
Hello and welcome bro!

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


Dither intensity = 1:

Dither intensity = 0:

Dither intensity = 2: