Hi guys, I've been wondering something, which if I ask it will put me in the category of ultra-dweeb-nerd, but I'm probably in that category already so here goes. I've noticed that when I scan my film at very high resolution and zoom way into the scan, I frequently see places where bright highlights are fuzzed over into neighboring dark areas slightly. In an extreme example, in an image of sunlight shining down through trees, some of the leaves are partially blown out by a flare effect from the sunlight. I notice a much more subtle version of this effect in many of my photos, where bright areas fuzz over into dark areas, creating a kind of pale halo in what should be a deep shadow. These are very small areas, only visible at huge magnification, but I make giant prints so it actually does end up mattering. Consequently I spend lots of time carefully editing these halos out in Photoshop so they don't show up in my prints.
What I'm wondering is whether this is some artifact of the imperfect optical process (I'm using the best quality modern equipment available), or whether maybe the film itself is reflecting the brighter light horizontally outward inside the film base, exposing the nearby areas. I have heard that some printing papers do this (it is called "piping") but I don't know if film does it. Does anyone happen to have any more-than-speculative knowledge about this nerdy subject?
~cj
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