Took a detour from the guided filter again. This time I have been working on making afre_gnorm and afre_hnorm ready for release. I may extend those commands later. In particular, a year ago, I discussed how the edge is uneven, being too bright or thick in some parts. There is also the amazing phase congruency (and its many applications) but I might never get to it. Currently, I have simpler ideas that I may explore soon.
On other news, afre_y50 is being extra fussy right now about there being exactly 3 channels, which gets in the way of general use; i.e., if RGB, then do command, else norm, or something like that. I will make the appropriate changes soon.