Rosetta - Early Orbital Operations at Comet 67P C-G, August 6, 2014 - November 13, 2014 |
Rosetta - Early Orbital Operations at Comet 67P C-G, August 6, 2014 - November 13, 2014 |
Aug 6 2014, 09:29 AM
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Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
Cheers at the European Space Operations Centre.
Well done! Rosetta has arrived Time for science!!!!!!! |
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Aug 8 2014, 01:47 PM
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Newbie Group: Members Posts: 3 Joined: 31-July 14 Member No.: 7226 |
Hello
First, think to Adelson's chessboard : http://web.mit.edu/persci/people/adelson/c...w_illusion.html As an example of "true" Moon rendition, using a small compact camera I shot a piece of wood charcoal (its albedo is similar to the Moon one) under Sun light in automatic mode : Light measurement was "spot" on background, on left and center, the background is a 18% grey chart, on right, it is current black paper. - Center is the standard result automatically optimized by the camera : the dark subject was slightly enlighted - Left was shot with asked 1IL underexposure, in order to obtain the official value of 128 for the background. - Right is the standard result automatically optimized by the camera : the dark subject was more enlighted, as well as the background. For me, the most realistic rendition is on left. But on right it shows more shades and details... PS : Note that the light rendition curve of the compact camera is far from linear and probably histogram adaptative, while scientific cameras are nativly linear... |
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