SAOImage DS9 (commonly referred to simply as DS9) is a standalone, open-source astronomical imaging and data visualization application. Developed by the Smithsonian Astrophysical Observatory (SAO) and funded primarily through the Chandra X-ray Science Center, it is the industry-standard tool used by astronomers globally to view, manipulate, and analyze scientific data. Core Purpose & Functionality
Unlike traditional photo editors (such as Photoshop) that process pre-rendered red, green, and blue (RGB) pixels, DS9 works directly with raw astrophysical data matrices. SAOImageDS9
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