OK, I understand the node set up fine. With such a wide image though, I'm having to scroll my screen from side to side to read every line of text. Any chance I could persuade you to delete that image and replace it with something under 800 pixels wide? I don't need the viewing square expanded in all those nodes and you can put them much closer together without it being harder for me to see what's going on. I wish there were some sort of post processing blur in the material nodes, but there's not. The best I can suggest is to ditch the image map altogether and replace it with something procedural. With the right settings, a spots node (or a few of them layered together) might work, but I think your best bet would probably be an fbm (or maybe I mean the fractal sum - I forget which). You can get it to produce varying size splotches at random on a black background and there's an upper limit to splotch size acording to the scale you set, so you might be able to get something that looks right.

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