I’ve been toying around with this for awhile now and even as I thought I had a good idea of the right scale for icons/banners, Lemmy’s tripped me up.
Searched in other communities & looked on other instances at some of their community icons/banners that look good, but there doesn’t appear to be much consistency. You see some 512x512 icons right alongside 256x256 icons and they both tend to look okay.
However in trying to emulate this with some images, I find the “previews” to be unhelpful, appearing to clip or sometimes stretch them.
Any advice would be much appreciated!
You can probably download the icon and banner for c/moderators and use that for the resolution. I think there are some cutting on the banner (not much), but as long as you have the main content in the middle, then it should be okay. Just right-click on the icon and banner and download them!