30th Anniversary Voyager 2 at Europa, a hint of things to come |
30th Anniversary Voyager 2 at Europa, a hint of things to come |
Apr 9 2009, 01:31 PM
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Member Group: Members Posts: 207 Joined: 6-March 07 From: houston, texas Member No.: 1828 |
It seems to be a season of anniversaries over the next year or so.
20 years since Voyager 2 at Neptune (see my posting there), 30 yrs since Voyager 1 at Io, 30 since Voyager 2 at Europa, 30 years since VEJUR at . . . . well never mind! plus all the Galileo 400th commemorations (I will have more on that next week). I thought it would be a good time to start a thread on this one, which occurred on a tuesday morning in July 1979. Although the images had been taken on July 9, they were recorded for playback the next day. I was a mere summer intern in those days and was attending the morning briefing along with the rest of the Sci Support Team of which i was a member. Linda Horn and Ellis Miner were my gurus that wonderful summer. Playback was scheduled for sometime between 8 and 9, as i recall, and I can still remember looking up at the monitor as the first high resolution images ever seen of Europa first appeared. Wonderful, even tho only 2 kilometers in resolution. Little did I know where it would lead me . . . Here is a restored version of one of the two mosaics returned that day. They hint at some of the exotic things that Galileo later discovered. cheers paul -------------------- Dr. Paul Schenk, Lunar and Planetary Institute, Houston TX
http://stereomoons.blogspot.com; http://www.youtube.com/galsat400; http://www.lpi.usra.edu/science/schenk/ |
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May 21 2013, 11:35 PM
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IMG to PNG GOD Group: Moderator Posts: 2251 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Yes, the same dataset with one exception: I didn't use any of the wide angle images for color, I only used narrow angle data. The drawback of this is the absence of green filter data but as mentioned above I don't think that's a big issue. But it's not always easy to know exactly how accurate the resulting color is.
One 'crazy' color processing idea I have is to somehow use Europa's entire visible spectrum together with the color information from spacecraft images to compute an entire synthetic, visible spectrum for each point in an image and use this to make synthetic R/G/B. I'm not sure exactly how I would do this but this would replace the linear interpolation that is usually used, both when mixing the color channels as I did above and also when the entire visible spectrum is created from (usually) three filters and then converted to sRGB. I doubt this will work very well though but I'm interested in trying it. One obvious complication is that the leading and trailing hemispheres have slightly different spectra and obviously the spectrum of a dark feature is different from the bright terrain. And there is no spectral information available in visible light that resolves these small (relative to Europa itself) features and also has high spectral resolution. |
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