Image optimization is one of the the “best practices” heading for Webmasters of all shapes & sizes. Don't forget the traffic coming by the image search. It is an extra benefit for your website when visitors coming to your website by image search.
To optimize a image for search engines like Google, you need to maintain 5 things.
1. A src attribute specifying the URL of the image
2. A width declaration in which the width of the image is specified in pixels
3. A height declaration in which the height of the image is specified in pixels
4. An alt attribute that describes the content of the image — this is the #1 element of image-oriented SEO
5. A title attribute that contains text to be displayed when the user hovers his/her mouse over the image.
Based on my search results from the past few months, I have every reason to believe that Google places a premium on two things when ranking images in its results:
1. the alt attribute of the image
2. the context of the page and the relevance of the alt attribute thereto
Of course, there are other factors that influence how high your images will rank, but I believe that these two are the most important.
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