Galileo images and mosaics of Europa |
Galileo images and mosaics of Europa |
Aug 22 2005, 04:03 AM
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
I have worked on sprucing up some global views of Europa from Galileo. There are a few more global views I hope to get to eventually. But the best two at nearly full phase benefited a lot.
[Moderator note: There are several more threads containing Galileo Europa images but they all contain several inactive image links. The main threads are: http://www.unmannedspaceflight.com/index.php?showtopic=2016 http://www.unmannedspaceflight.com/index.php?showtopic=2174 http://www.unmannedspaceflight.com/index.php?showtopic=2222 http://www.unmannedspaceflight.com/index.php?showtopic=2082 http://www.unmannedspaceflight.com/index.php?showtopic=2142 ] -------------------- |
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Aug 23 2005, 12:50 PM
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Member Group: Members Posts: 378 Joined: 21-April 05 From: Portugal Member No.: 347 |
If you consider the Galileo filters and their wavelenghts, you have:
Violet - 404 : Green - 559 : Red - 671 : IR756 - 756 : IR968 - 968 The human color vision has a peak response of: Blue - 440 : Green - 510 : Red - 650 So to "convert" the Galileo filters in to "human colors" we can mix images from different filters to get the proper wavelenghts. I've calculated the ratios and corresponding wavelenghts: 75% Violet + 25% Green = blue (443) 70% Green + 30% Violet = green (513) 80% Red + 20% Green = red (649) 50% IR756 + 50% Green = red (658) 20% IR968 + 80% Green = red (641) I've tried this on two Europa images and the results look good. Saturation is low, but that's expected when you mix the color data. Also, Europa looks white through a telescope anyway ;-) -------------------- _______________________
www.astrosurf.com/nunes |
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