00487nas a2200169   4500000000100000008004100001653000800042653001400050653002300064653001600087653001600103100001600119700002100135700001500156245004900171856009700220       2008                            d10asky10aluminance10ahigh dynamic range10aphotography10ameasurement1 aAxel Jacobs1 aStephen Wittkopf1 aLars Grobe00aPer-pixel sky luminance with HDR photography  uhttp://www.radiance-online.org:82/radiance-workshop7/Content/Jacobs/jacobs-fribourg2008d.pdf