1. A method, comprising: assigning each of a plurality of images in a blog post and each of a plurality of images in a collection of images to a respective node in a graph; computing an adjacency matrix for the graph, wherein the adjacency matrix defines relationships between images in the blog post and images in the collections of images; and determining a first subset of the images in the collection of images that summarize the images in the image collection, wherein the subset is determined based on the adjacency matrix and the adjacency matrix is computed based on the subset of the images in the collection of images.