Introduction to Image Reduction
Introduction to Image Reduction
Introduction to Image Reduction
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Motivation & background Instrumental Signature Removal Combining multiple images Pho<strong>to</strong>metric calibration<br />
Bias and dark frames<br />
Bias (or zero) frames measure how the zero-light ADU level changes<br />
across each row. Always take multiple frames per night and average them<br />
for a robust measure.<br />
Dark frames measure how this level changes with time: usually negligible<br />
in modern cameras, but you should always check.<br />
Subtract the bias or dark frame from each data frame.
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