Sort by subject in Google Images

Article From http://googleblog.blogspot.com/2011/05/sort-by-subject-in-google-images.html

When you’re searching for images, sometimes it can be hard to come up with exactly the right words to describe what you have in mind. For example, when you think of London, you might picture the iconic clock tower or the big Ferris wheel. You may not always remember the names of those landmarks, but you can visualize them in your mind. To make it easier for you to find images in situations like these, you can now use Google Images with sorting.
When you search for [london], by default you’ll see image results ranked by relevance. Click on “Sort by subject” in the left-hand panel and you’ll see images organized into categories that will narrow down your search and help you find the exact image of London that you want.

Sorting by subject shows that some of the most popular images associated with London are the London Eye, Big Ben, Tower Bridge and the city at night. This organized view helps you find the images you were visualizing more quickly, so you might realize, “Ah, that big clock tower is called Big Ben, that’s what I was looking for.” You can then can click on the Big Ben group to find the best image within that subject group.
You can also use this feature to explore categories of a general topic that may be easier to learn about visually, like flower varieties or dog breeds. For example, if you want to get flowers for someone but you only know what their favorite kind looks like, not the name of it, you can sort by subject to learn different flower types and discover the name of the type you’re looking for. Watch this video to learn more about how sorting can help you find the image you’re seeking:
Sorting by subject uses algorithms that identify relationships among images found on the web and presents those images in visual groups, expanding on the technology developed forGoogle Similar Images and Google Image Swirl. By looking at multiple sources of similarities, such as pixel values and semantic relationships, and by mining massive amounts of data, we can make meaningful connections and groupings among images.

Sorting will be rolling out globally to nearly every domain and language over the next week. Whether you have a particular image in mind or you’re just exploring a general topic, sort by subject can help you find the image you need—even if you don’t have the exact words to describe it.