>>11952391
and with text for example, the result of 'blur then contrast up' is a phenomenon which if you do it deliberately is called the 'morphological operations' of dilation and erosion. Basically if you have a craggy shape and you puff it out a bit and then trim it back, you get the same shape but with the crags filled in.
So if you see the top of the 't' here, it becomes a nice diagonal line instead of that pixel staircase that I don't believe was ever expected to be seen