It looks a bit like merging Reshade with SL which unfortunately does not work with native SL snapshot (you can only take a screenshot that is your monitor resolution and it does get great effects if you can change that to a 4K one). I'll give it a spin tomorrow and compare as I am currently faffing with Reshade on SL so am curious if this works similar but if it replaces files it might be had a better idea.
Edit: I looked on Flickr if it brings anything up and effects do indeed look like older Reshade which could be maybe even SweetFx as bloom resembles that.
Edit where there is link to photos: And turns out it does work like something akin to Reshade as the files do overwrite SL's including some settings but you cannot go beyond your window resolution and you do not get access to shader settings like Reshade. Gameplay wise, it is oddly smooth and I can see a use in videos that are screen recordings. Post processing can be a bit blown out with regards of bloom but that only is noticeable outside. However, there is a con and it is a major one - clicking any UI buttons in Singularity made it randomly display a black flickering screen while it did not crash as I still could hear SL noises of me clicking around (but could not move camera). It seems to particularly hate any "okay" or "apply" button. Could be because I was using Singularity newer than PyFX. Anyway, here is photos of results:
(imgur link)