I recently came across an article on the site www.nngroup.com from 2010 that went into detail about the value of the proper kinds of images for a website and how it can have a serious effect on the success of the business.
One of the most interesting statistics in the article said that: "users pay close attention to photos and other images that contain relevant information but ignore fluffy pictures used to "jazz up" a website"
The writer is Jakob Nielsen of the Nielson Norman Group and he has done a stellar job of making the reader understand the mindset of website visitors and how images play a big part in how they deal with a site based on its images.
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