Adobe Photoshop CS6 is the industry-standard image editing software, used worldwide by professional photographers, amateur photographers, and designers who want to perfect their digital images.
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Having support for HiDPI along with Retina displays will add a completely new dimension to CS6 because it will allow the images you are editing to look so much more detailed than ever before.
I have to recommend this software as both the industry standard and as a creative powerhouse of tools which far exceed my own potential. In short, don't balk at Adobe Photoshop, it's absolutely amazing.