Posted by Sven on July 12, 2004 at 20:20:16:
In Reply to: Digital Time Exposure posted by Ross-O on July 10, 2004 at 22:03:08:
>Very nice picture, Chris! I'm amazed that the
>8080 can do time exposures that long and not
>be completely blown out by "hot pixels".
It is a beautiful picture !
You can compensate for hot pixels by taking a second image with the same exposure, leaving the lenscap on. Then you invert (negative) the second picture and add it to the first. We use that technique in planetary space craft and there are some software packages that do it automatically (Photoshop ?).
The above technique won't cure random noise, just hot pixels and other "defects".
Again, beautiful picture !
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