I was trying combinations of Intel Open Image Denoise with variable number of samples in Cycles Render. To do this, I pick a scene that I’m working on and I rendered with 25, 250 and 2500 samples to compare the looks and render time difference.
I used blender 2.82 with Cycles Render using GPU (AMD Radeon Rx 580 Dual, 8GB) . The render dimension was 2880x1620 pixels and, in all results, I used the Intel Open Image Denoise with the same post production nodes in Blender Compositig.
25 samples - 00:08:30 minutes.
250 samples - 00:52:40 minutes.
2500 samples - 08:10:40 hours.
First, the Intel Open Image denoiser is really powerfull, it can get good results from really noised images and, in my opnion, can get a much better result then Blender Denoiser, NVidia AI Denoiser, V-Ray Denoiser and etc. I know that this topic is not comparing the denoisers, but it’s worth to talk about it.
It’s notable the difference between the Image with 25 samples and the others, but the visual difference betwen 250 to 2500 samples is very small, while the render time is so disparate! We know that most people will see the images that we made in a little screen, like a smartphone, therefore the difference will be even smaller. So, in my cases, 250 samples with the Intel Open Image Denoise it’s a best cost benefit.
Thank you for watching and, please, post your opnion about this comparasion!!