[QUOTE="Maniacc1"]I just did the brightness thing on the image. There definitely IS something there that doesn't belong. I'm not one to believe in conspiracy theories... but my question is what the hell is that?! :PGabuEx
Already explained in the first post. :P
NASA's Emily Lakdawalla, who was responsible for the photoshopping, explained it over at Planetary.org:
Cassini takes color pictures by snapping three sequential photos through red, green, and blue filters. In the time that separated the three frames, Dione moved, so if I did a simple color composite I would be able to make Titan look right, but not Dione; or Dione look right, but not Titan. So I aligned Dione, cut it out, and then aligned Titan, and then had to account for the missing bits of shadow where the bits of Dione had been in two of the three channels.
She explains the process further here, showing how some other images of Saturn and its moons have been photoshopped — but she didn't post any raw images of the Dione/Titan image that caused the controversy. So at least some conspiracy theorists were not appeased, demanding to see the raw images.
TheShadowLord07
Exactly.
See...I don't know if people realize this, but their color digital cameras don't actually record color. They record LUMINOSITY. Each photosite is only designed to record HOW MUCH light is reaching that photosite. The reason that our digital cameras produce color pictures is because each photosite has a red, green, or blue filter over it. It's then possible to use the luminosity value from the red photosite, match that with the luminosity from the R, G, and B photosites next to it, and then ARTIFICIALLY determine the color for each individual pixel based on a complex mathematical formula which takes into account the luminosity from all adjacent photosites.
Again, no color recorded. Just luminosity values which go through either the red, green, or blue filters.
I don't know crap about NASA technology, but the explanation provided is a perfectly 100% satisfying explanation. It's merely just a different variant on producing a color image by combining different data from separate color channels. That's it. Unless anyone can show that that's not how the camera on the spacecraft works, then the explanation for the Photoshopping seems entirely plausible.
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