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this is very good! is it possible to save the filtered images locally?

It basically uses the toDataURL() method to get the image data of the canvas.

well, this method downloads a file without a .png at the end (and most users are overwhelmed with the task of renaming a file)

think there is something coming with BlobBuilder and FileSaver, but i haven't hat time yet to give it a spin http://dev.w3.org/2009/dap/file-system/file-writer.html#idl-... and an example here http://updates.html5rocks.com/2011/08/Saving-generated-files...