For the maximum sharpness on #n64Digital by #PixelFXco, e.g. on a >=1440p screen use modeline.ini via web interface to add some more resolutions:
https://docs.pixelfx.co/N64Digital-Custom-Modelines.html
See the difference between 1080p | #1440p. These are "non-HDR" captures, HDR10/HLG is also available. #n64