Does Appcelerator support any kind of APIs capable of reading/writing JPG or even better, RAW images? The image would be stored as arrays of rgb pixels.
Some implementations of the Canvas object allow bitmaps to be processed pixel by pixel, but saving your image transformation to a file format like JPG might be a problem.
This would open the door to numerous imaging/photography/art applications.
Checkout Processingjs.org - they provide a js lib for doing much of what you're after. It's a JS version of processing.org which has all sorts of wizzy things
You can include JS libs in Appcel - there's a jQuery example in the KitchenSink.
Please look here for a promising, but not yet perfect solution:
Other thread on getting RGB's
Hopefully there are some smart brains out here who can make this into a flawless tool.