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Why is the image overexposed?
Cassini's cameras have 63 different exposure settings, from 5 milliseconds to 20 minutes. Scientists planning an observation must choose the exposure for each image taken. That can be tough if you're taking a picture of something you've never seen before. Thus, incomplete information on how bright something can be can lead to an underexposed or overexposed image.
Images can be overexposed on purpose too. If the scientist is looking for something dim next to something bright, the bright thing may be overexposed. Finally, Optical Navigation personnel use images to see where Cassini is relative to Saturn and its moons. Often they overexpose images because they need to see where these moons are in relation to the stars in the background sky.
What are those streaks I see in some images?
There are high-energy particles that fly though space called cosmic rays. When one of these particles hit the camera's sensor, it causes a bright spot. When one of the particles hit the camera's sensor edge-on, it can leave a trail across the image. Exposures shorter than a second will not have many of these spots or trails. However, long exposures, like those from a minute to 20 minutes will contain many of these trails.
Originally posted by JohnPhoenix
About your video. I like the big gal on the Ninja. :-)
Originally posted by nophun
reply to post by stanlee
No I don't even know what you are trying to say or "get it" because your video is retarded and I refuse to watch it.
[edit on 26-1-2010 by nophun]
4-40 milliseconds is really not enough time for THAT drastic a change
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