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What online image editing / image manipulation web applications exist? Features?
What are some good (if any) web app alternatives to Photoshop?
I am aware of SketchPad/DarkRoom, Aviary and Thumba, but of those only Aviary suite comes close, and even it is lacking a lot of essential effects (or I don't know where those are).
I think Aviary.com is a pretty good one, and one of the first to market. Picnik is getting some heat right now and Yahoo/Flickr seem to stand by it. But I don't think you are going to get anywhere near the power of a desktop app. Some of other popular sites not mentioned include Splashup.com and Sumopaint.com.
I'd say Pixlr is one of the best I've used. You can even jump straight to http://pixlr.com/express/ and start using it without registering or other faff.
