Blender 2.81 denoising

Clear explanation. I allready had increased the samplecount to 1024 without any result. Thought of blur by OIDN but could not figure it out. You set me on the right track. The finished scene will be printed at 1 by 2 meters and the render will be done by a renderservice. Because off my to slow machine i use during developing relative low resulution and usually for testing 500 samples. For most of the time that works good enough. Now with OIDN I run into the problem of the finer details. Your suggestion to use a bigger resolution did the trick. Doubled it and now i’m again able to see the details.