PSA: When uploading png images to deviantart, if you have 1 pixel that is slightly transparent (even 1% transparency) then it won't compress the image as a JPEG and you will get nice image quality on the site.
(Downloads remain unaffected)
Deviantart compresses and converts all opaque png uploads to medium quality JPEGS by default, but it can't convert transparent images. I found out tonight that this is a good way to bypass the current system until it is fixed.
tags for google idk: how to get around deviantart image compression fix eclipse png to jpg jpeg site