Hi and thanks for your work on your plugin, it's very neat!
I debated where to post my question and sent it to stackoverflow (colorbox suggests it for support) first. I'd like to bring it up here though as well.
Colorbox sets explicit and static width and height values for the lightbox view (1024x768) which seemingly prevents "Adaptive Images"* from applying the correct images.
I don't think that colorbox advertises responsive images, but could it be modified to work? I'd love to stay with colorbox (and your plugin!)
* A server-side plugin in PHP which rescales and caches images based on @media query breakpoints