For general-purpose photo editing, the software that comes with your camera may be adequate, especially if you pair it up with relatively powerful astronomy software. What you need is the ability to crop and resize pictures, adjust contrast and color balance, and make prints.
The king of the photo editors is of course Adobe Photoshop, which is one of the basic tools of computer graphics; many scientific add-ons for it have been developed. But Photoshop isn't cheap. An alternative is Photoshop Elements, which may even come with your DSLR; this is a cut-down version of Photoshop that does not process 16-bit TIFFs but is otherwise satisfactory. Or you can use its leading competitor, Corel's Paint Shop Pro (www.corel.com). Note that there are often upgrade discounts for people moving to Photoshop from Photoshop Elements or from competitors' products.
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