[JTB]

I try to minimize the rendering times because I always have very tight deadlines.
To do this, I have to keep the image size as small as possible and stop the rendering when next SL is more than 3-4 hours away.
To improve my results I have to use
1. Noise cleaner
2. Image resizer.
My question is : Which is the correct way to do this?
First clean, then resize or the opposite? I don't see any great difference.

[ingo]

Me thinks it depends on when your denoiser works best. If you do it at original resolution you have more high frequency noise, when you denoise after scaling down you have more medium and low frequency noise.

[simmsimaging]

With most digital images it will vary depending on the detail level and scale in the actual image, and renders will be the same I think - so there is no way to say for sure. It's not just noise you have to think about - sometimes your textural detail is not much different than noise in size/contrast - like an image of sand or carpet vs. a smooth flat coloured wall. Very often the noise *is* your high frequency detail and you have to handle it carefully.

Short story is you will have to try it both ways on each shot and see which works best. There won't really ever be one surefire way IMO.

b

[JTB]

Thank you both.

[Luca_Studioaltieri]

imho only noise cleaner is good, because after "X hours" a bigger render if resized it will have lower S.L.: this means lower illumination and reflections quality.

if you use noise cleaner you will have also more "noise" settings to give your render better look and more quality image.

[ingo]

Actually much better will be if you use your noisecleaner with different settings on different objects, depending on the amount of detail you need for each object/surface. And clean before sizing down, thats the best way to avoid cleaning away needed details.