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|Description||Dark frame. Subtraction of the dark frame and flat field correction applied to the original, raw CCD image results in the final, calibrated image. The dark frame is taken with the same exposure time, at the same operational temperature, as the raw image, but with the shutter closed. It records the dark current in the CCD chip. Numerous "hot pixels" appear scattered over the frame.|
|Author||H. Raab (User:Vesta), Johannes-Kepler-Observatory, Linz, Austria (http://www.sternwarte.at)|
All images of the series showing the calibration of a CCD image:
GNU Free Documentation License
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