Monday, December 29, 2008

Image Search Optimization

As an obvious first step, figure out how images can and should fit into the user experience on your site. This is a non-trivial step. Then, determine how and where you can obtain original images for your site. Image search engines don't like duplicate content any more than web search engines, so you need to obtain your own original images. Once you have this in place, here are the major steps you can take to optimize for image search engines:

  1. Use keywords in the alt tag attribute. This is a critical step, as it is the one best opportunities you have to unambiguously label the image. Bear in mind that there is a huge amount of search volume that includes words like: photo, picture, image, pics, pix, or locations. Regarding the locations, if your image is a picture of a physical location, include some location information in the alt tag attribute.
  2. Note that the title tag attribute is usually ignored. Don't waste your time on it.
  3. Pick a logical file name, that reinforces the keywords. Using hyphens in the file name to isolate the words in the keyword is an OK to thing, just try not to exceed two hyphens. Do not use underscores as a word separator.
  4. Use a descriptive file name, in a similar fashion to the alt tag attribute.
  5. Pay attention to the file extension too. For example, if the image search engine sees a ".jpg" (JPEG) file extension, it's going to assume that the file is a photo.
  6. Basic web page optimization applies too. For example:
    • The title tag of the web page
    • The text nearby the image
    • The overall theme of the content of the page
    • The overall theme of the site (or section of the site)
  7. Also important is to get links to the page with the image on it. This could become an entire link building discussion in itself, but one simple way to do this it to post the pages with images on them to del.icio.us.
  8. Avoid duplicate content on your site. If for example, you have a thumbnail, a medium size image, and a full size image, you don't want these to all be indexed. The best way to handle this is to use robots.txt to prevent the crawler from looking at the versions you don't want indexed (most likely this would be the thumbnail or the full size image).
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