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Old 25-10-2013, 02:25 PM
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naskies (Dave)
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Join Date: Jul 2011
Location: Brisbane
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With darks and dark flat frames, each pixel consists of the following:

LightPixel = Bias + Dark + LightSignal
FlatPixel = Bias + DarkFlat + FlatSignal
DarkPixel = Bias + Dark
DarkFlatPixel = Bias + DarkFlat

Calibration involves the following:

Calibrated Light Pixel = (LightPixel - DarkPixel) / (FlatPixel - DarkFlatPixel)
= (Bias + Dark + LightSignal - Bias - Dark) / (Bias + DarkFlat + FlatSignal - Bias - DarkFlat)
= LightSignal / FlatSignal
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