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I'd like to implement a very simplistic image editor (similar to http://mugtug.com/sketchpad/ ) on my website, so that users can have a trivial playground... Say I have a black and white sketch (png) that I want to let them color.

In theory I could develop the entire thing using Canvas, but I'm hoping something like that is already developed. All I need is "paint brush" tool and "fill bucket" tool ... that's it.

This is the closest I found, though i think it's not the best implementation: http://athousandnodes.com/labs/canvasFun/

Are there known better solutions?

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Though I've never had to try what you're asking, Picasa uses Picnik for photo editing. The API for use on your website is at http://www.picnik.com/info/api .

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I think Google closed Picnik down a few years ago (reported in Jan 2012)? readwrite.com/2012/01/20/… – w3dk Jan 16 at 11:49

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