It should be possible to make a JavaScript page that downloads a JPG, like:
- http://stackoverflow.com/questions/20035615/using-raw-image-data-from-ajax-request-for-data-uri
- https://github.com/jseidelin/exif-js/blob/master/example/index.html
- http://code.flickr.net/2012/06/01/parsing-exif-client-side-using-javascript-2/
Then modify the bits, and pass them through this:
- https://github.com/notmasteryet/jpgjs/blob/master/jpg.js
And render to a Canvas. This would allow a simple UI where the consequences of bit-flipping a JPG can be explored:
- mouse-over an image that represents a JPG bitstream.
- Flip the bit and run it through jpg.js.
- Show the results
- Colour the pixel based on the outcome (black if no change, red if change etc.)
- Could also add JPG metadata extraction, and add another colour for that.
- https://github.com/jseidelin/exif-js
