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05.24.07
Google Software Engineer on Google Images
 By Philipp Lenssen
I’ve asked Google some questions in regards to their image search engine. Here are the answers by Radhika Malpani, Senior Staff Software Engineer at Google.
Google is confident they have the best web search, if you apply quality metrics through testing. Are you also confident you have the industry’s best image search engine too... and if so, why?
Yes. To create the best image search engine, we focus on comprehensiveness, relevance, and user experience. According to our internal testing, we score the highest when it comes to all 3 factors combined.
I’ve launched a new domain with many images around half a year ago... and half a year was also about the time it took for the first images to show up in Google (using a “site: example.com” query). Isn’t that quite slow? And what factors influence the speed of image indexing?
Many factors are involved before images show up in Google search results. One of the key factors is the PageRank of the site which the image is on.
You do a good job in filtering out adult images for non-adult search queries, whereas Yahoo’s image search is often showing adult stuff on non-adult terms. What approaches do you use to make your results safe?
This has been an important area of focus for us. We have created advanced proprietary technology that checks keywords and phrases, URLs, and the image itself.
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Google Image search was temporarily showing in a new design for all users – a design which was revealing certain image information on mouse-hover only. Why did you guys decide to revert back to the old version?
Google is always working to improve search. Any changes we make focus on improving the experience for our users. In this particular case, users did not find the user experience in this experiment as helpful as the previous experience, and so we decided to end the experimental user interface.
In Google Images, you can choose between “large”, “medium”, and “small” images for results. What are the specific pixel dimensions behind these terms, e.g. where does “medium” end and “large” start?
Currently, the dimensions are small < 51 x 51, large >= 1024x768, and medium captures everything in between. As images continue to improve with the advances in digital photography, these dimensions will likely change over time.
What can you tell us about how Google ranks images? For websites, there’s e.g. PageRank... what’s the approach for images?
We use many signals to rank images. Some examples of signals include PageRank of the web site, text describing the image, and the image itself.
Do you have any tips for webmasters in regards to how they can get their images indexed best?
We recommend having high quality images and creating useful websites that accurately describe these images. We suggest that your alt and title tags accurately describe your images as well.
Continue reading this article.
Philipp Lenssen from Germany, author of 55
Ways to Have Fun With Google, shares his views & news on the search
industry in the daily Google Blogoscoped.
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