I understand the size limits for uploading profile pictures, but is there an optimum size and/ or colour set that'll help the picture retain its quality when it's displayed?
I've recently uploaded a pic that's very simple, and looks nice and smooth on my Profile page and in the Profile Pictures browser - but horrible when displayed with my posts. I realise the format is smaller, yet I've seen other users' avatars that are similar but display well.
I've tried lots of different sizes, including much smaller than 1000 x 1000 px, and all of these look great when viewed externally - but not on the page. Is there some form of compression at work other than just resizing the image, and if so how should I optimise for it?