On our test site, we have several breaks set up and I believe we have the needed content containers: http://www.lifeleap.info/test22/sample-page/
Now, when screen size is reduced to the point where image is reduced, the image size (bytes) stays the same.
On your installation page, you mention: "Edit your theme's CSS to add picture.hammy-responsive, in a way that it is identical to any img styling used for your content area."
Could you explain in more detail how to do this so we can implement this into our stylesheet? This is a powerful plugin and we would love to get it working. Thank you for creating a great plugin and any suggestions which may help.