An example Dropwizard app that uses photon-core to process Twitter avatars on the fly.
The original image
Resized to a width of 200px (;w=200 added to the original URL)
Rotated 180 degrees (;r=180 added to the original URL)
A crop of just the face (;c=130,60,200,200 added to the original URL)
Cropped to the face, rotated, then resized
Try it out on your own avatar: https://photon-example.herokuapp.com/{your-twitter-user-name}