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Jan 6 2006, 08:55 PM
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#101
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Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
ADMIN NOTE: Please note that this topic was unavoidably poltical before the 'No Politics' rule. Please restrict future comments to the mission/spacecraft/news updates etc.
WHAT'S NEW Robert L. Park Friday, 6 Jan 06 Washington, DC DEEP SPACE CLIMATE OBSERVATORY KILLED. http://bobpark.physics.umd.edu/index.html -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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Apr 30 2016, 06:46 PM
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#102
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Senior Member Group: Members Posts: 1669 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
More details on these synthesized Earth images can be found in my inaugural Planetary Society blog post.
There are a series of comments to this post. I was cutting my two comments a bit short to fit in the character limit. Thus to be more complete I would insert the following paragraph in between these two comments: .......................................... The question about brightness and contrast relates in part to step (3) in my post. One way to check this is to consider that the brightest clouds have a reflectance of about 100%. The cloud-free ocean regions with the Rayleigh scattering (and a slight augmentation from aerosols) should have a reflectance of around 12% in green light (550nm). If the bright white clouds are set to a pixel value of 255, then the green component of the the ocean regions should be 255 * (0.12 ^ 0.45) or 98 counts. The 0.45 power is the gamma correction I'm using to account for the non-linear brightness relationship between pixel count and displayed intensity on a typical computer monitor. .......................................... I might also add that the question of how to set brightness, contrast, and color saturation applies just as much to everyday photography as in spacecraft imagery. I'm following the notion that it's good to have the displayed image be as linearly proportional as possible to the actual scene, with the same color saturation. (Edited May 31, 2016) -------------------- Steve [ my home page and planetary maps page ]
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