So after an arduous weekend of coding, I come from high on the mount bearing tablets with the following features: You may now export the saved image (AKA download), also there’ve been numerous corrections to the convolver, as well as adding a filter settings dialog with a built-in preview. I added an eyedropper to help with colorpicking, and I made an overhaul to the Gaussian Blur filter which now allows it to generate a kernel of any size. All in all not a bad haul for a single weekend.
So go check it out.