Board Thread:Support Requests - Getting Technical/@comment-25411062-20150205025101/@comment-126761-20170322013900

As I understand it (as additional info was supplied elsewhere), the issue referred to above is that pixel perfect PNGs can have slight variations when rendered in WebP that affects tools like 'fill' in image editing programs. This is somewhat expected, since the general purpose of images on wikis is to effectively display, not store, them.

Given that, the 'download' link on file pages should help users get the file in it's original format if they need to edit them. (I'll see above improving documentation around this.)

All that said, we are very happy to look at examples of visible downgrades in quality - losing quality is not the purpose of the switch to WebP - so I do encourage problem examples to be sent in to Special:Contact/bug. Thanks!