In a Graywolf's SEO blog entry, Michael Gray noted that images can be an effective way to "passively build links slowly over time".
He cited as an example a situation that occurred with one of his clients, who allowed an image of a fish on his online portal to be used in exchange for a link.
Those hoping to optimise images for SEO purposes were advised to use jpegs or gifs and to name them using keywords.
Also, the expert said the alt text included with the picture should be carefully thought out to include keywords.
Captions might be another way firms can use their images to draw more traffic to their website and boost their rankings on search engine results pages, he suggested.
This comes after Patricio Robles said in an Econsultancy blog that descriptive image names should be used on websites.
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