rflickr is a Ruby implementation of the Flickr API. It includes a faithful reproduction of the published API as well as method encapsulation to provide more useful object mappings. rflickr features result caching to improve performance.
Most people don't realize how many popular photo services like Flickr, Smugmug and Picasa offer web APIs. In this overview, we'll take a look at the breadth and power of currently available photo APIs and the types of photo mashups developers are building with them.
Google Cloud Vision API gives developers access to powerful image processing and analysis tools for use in any project. This tutorial on Google Cloud Platform shows followers how to use the API to detect faces in an image, and use the returned coordinates to draw a polygon around each face.