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Q2/ As for removing dust motes from your pics. You need to take flats. I'm not sure of the exact algorithm used for flats but it uses the inverse of the value of each pixel in the flat and adds or subtracts that from each pixel value in your image and in this way your original data the dust mote will be removed from your image. Like I said what i have stated above is probably not 100% correct but it gives you an idea of how it works. Hope these have answered your questions and not confused you more.
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