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What is a good and free image editor? (Alternative to Photoshop)

Does anyone know of any free image viewer (or preferably editor) that can work with very large images (say, 30,000 x 30,000 pixel PNG or JPGs)? I know Photoshop works with those well and renders them very well, but other programs are either slow or use huge amounts (gigabytes) of memory. The built-in Windows previewer is almost good, but it's still a bit slow and uses a bit too much memory, and it's also not an editor... does anyone know of any such software?

Edit: A programming library would also be fine, so long as it works for large images.

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marked as duplicate by slhck, nhinkle Aug 8 '11 at 20:37

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Try Irfan View. –  Sathya Dec 15 '10 at 13:32

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Try GIMP or Paint.net. Both are free image editors so you might have some luck with them.

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GIMP took > 30 seconds to load, with > 1 GB of memory, and Paint.net crashed at 1 GB (I have 3 GB free though, it's not a memory issue). Thanks for the suggestions though. –  Lambert Dec 15 '10 at 9:42
    
GIMP is a good alternative. –  qroberts Dec 15 '10 at 12:52

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