Saving images rendered with optiX and tuning render parameters

Hi, I’m rendering a scene using the optiX pathtracer. I have a couple of questions:

  • What’s the best combination of numbers for Samples per Pixel and Progressive Passes, for a final image? I’m setting 64 and 1024, respectively, but I’m not sure when Paraview stops rendering the image

  • How do I save the final rendered image? I tried Save Screenshot but this starts rendering the image again. Is this the best option to save a final result?

  • How can I set a white background for a render? Because the background color option does not work for optiX rendering. I’m currently using a plane but sometimes it interferes with the lights of my object if I want a pure white background.