Dear Clément, I think the reason why the sky around the complex appeared a bit darker is "lateral inhibition" - a mechanism that reduces the sensitivity of the retina around a bright spot, thus increasing contrasts. Christian. ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
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