Introduction to Image Reduction

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Motivation & background Instrumental Signature Removal Combining multiple images Photometric calibration Overscan Determines ADU level corresponding to zero light, by reading out virtual pixels after the last real pixel in each row. Subtract the overscan level from each row.
Motivation & background Instrumental Signature Removal Combining multiple images Photometric calibration Bias and dark frames Bias (or zero) frames measure how the zero-light ADU level changes across each row. Always take multiple frames per night and average them for a robust measure. Dark frames measure how this level changes with time: usually negligible in modern cameras, but you should always check. Subtract the bias or dark frame from each data frame.
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Introduction to Image Reduction

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