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reply to post by Arken
Did anyone ask about the picture with the mountains in the back? AS in how would a cosmic ray go through them to hit the camera lens? I would think there would be lights coming in OVER the horizon if they were cosmic in nature, but maybe I am crazy.
reply to post by openminded2011
Occassionally the particle will be passing through at a shallow angle to the plane of the CCD and affect a number of pixels along its path creating a bright streak.
What happens when a bucket fills up to the brim with water? It overflows. The same thing happens in CCDs. A pixel can only hold so many electrons before it overflows. Because of the way the pixels are made, the overflow goes into the adjoining pixels horizontally, so the overflowing pixel leaks electrons into the pixels to its left and right (or above and below it). If enough light is hitting the one pixel, it can overflow the adjacent pixels, which flow into the next ones, and so on.
Jpeg compression goes one step further, by organising regularities in the visual perception of an image and using lossy compression to reduce the file size of the image. This process involves a small but irreversible loss of quality as discussed in the errors below.