Flickr's taken the opportunity to explain how it did what it did, with a taste test. It gamified the whole thing, asking users to choose between two photos, selecting whether compressed and uncompressed images differed. If they got it right, the test code then asked which they preferred and why. God bless humans, though, who selected "identical" at the same percentage, whether the two photos were the same or not.

After eighteen months of this level of "perceptual compression", the team decided to shrink images an extra 15 percent, for the sake of usability on mobile. Flickr ran the same tests on this newer setting and while users were able to spot compressed images slightly better than before, the team deemed it good enough. This was where several users picked up on it, (check Petapixel's noticeable comparisons). This week, Flickr has responded to sharper-eyed users, tweaking its compression settings to somewhere between the previous level from 2014 and the more recent adjustment. And no, this isn't gonna fix those supermoon shots -- they were pretty sketchy from the outset.