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An introduction to quantitative astrophotography on Linux: Part 2 - RAW to FITS and Dark Frames

21 Jul 2014, 11:33 UTC
An introduction to quantitative astrophotography on Linux: Part 2 - RAW to FITS and Dark Frames
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In part 1 of this series I introduced my reasons for wanting to look into what I called quantitative astrophotography, by which I mean getting god quantitative estimates of the performance of a very simple, entry level, set of DSLR images of the night sky. I wanted to control and understand the quantitative changes made to the images, and hence chose to avoid the Windows-based GUI software common in the amateur astronomy world. Instead I'll use standard astronomical data reduction and analysis techniques and stick to open source tools running under Linux (actually in this case, OSX with macports).By the end of part 1 I was in possession of ~30 RAW images taken with a Canon Digital Rebel XTi, including a series of dark frames and bias frames. This article covers the next step in the process: converting the RAW images into FITS format, along with a quick look at the dark frame properties. The process of finding the bad pixels and removing them from the images will be covered in Part 3.The flow chart summarizes the actions that need to be performed on the RAW images to end up with FITS images that have had the bad pixels, the ...

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