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Photometry with AIP4WIN: a TutorialPart 4 - Image Calibration

12 Dec 2014, 18:00 UTC
Photometry with AIP4WIN: a TutorialPart 4 - Image Calibration
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v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} By R.D. BoozerThe following three images depict actual final master frames produced when AIP4WIN processed the supplied raw FITS files.Figure 14: The final master bias frame.Figure 15: The final scaling master dark frameFigure 16: Final master flat-field frame with the V filter.The master bias and scaling master dark frames shown in Figures 14 and 15 do not really reveal any important information to a human viewing them. They don’t need to. They exist solely for the software to optimize the image by eliminating electronically generated artefacts that are beyond a human being’s control.However, the master flat-field frame is a different story since it may sometimes reveal problems that are the result of human negligence. In the illustration depicting the master flat-field frame, I have labelled a number of common mostly minor issues that seldom cause serious problems, since the purpose of the master flat-field frame is to counter those effects. Nevertheless, sometimes imperfections happen due to simple carelessness and may be so severe that flat-fielding will have difficulty fully correcting them. Such is probably the case with the small solid grey oval labelled “?” that appears near the bottom of the frame ...

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