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When the topic of Photoshop versus Photoshop Elements used to pop up at Dpreview.com years ago, the purists would always point out that Photoshop Elements was inferior as it did eight-bit processing versus the 16 bit processing of Photoshop (or some such, my memory of the figures may be incorrect). I don't know if that is still the case.
There were lots of books written about using Photoshop for astrophotography, and they were using older versions of Photoshop, when it was a stand-alone program. If you are using such a book, it shouldn't be too hard to find the same software at certain sites on the internet - though the learning curve would still be big.
As for me, I'm still using Photoshop Elements 7 for fixing my photos. I did buy a cheap copy of Photoshop Elements 12 a year or so ago at Harvey Norman, but haven't gotten around to installing it yet.
Regards,
Renato.
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