Introduction to Image Reduction

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Motivation & background Instrumental Signature Removal Combining multiple images Photometric calibration Cosmic ray rejection strategies • Start by building observatories/cameras with low-radioactivity materials! • If you have only one image, you can still identify most CR (at the catalog stage) as narrower than the PSF: • If you have two unshifted exposures, you can compare and mask. • Most often, you have multiple exposures and you can reject CR while stacking • CR are not the only things that change from image to image: also asteroids and satellite trails.
Motivation & background Instrumental Signature Removal Combining multiple images Photometric calibration Combining multiple images: prerequisites • coordinate transforms between stack and each exposure • relative photometric throughput of each exposure • relative S/N of each exposure (for weighting) • masks for each exposure • sky model for each exposure • other metadata for each exposure: eg saturation level • (ignoring PSF for now)
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Introduction to Image Reduction

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