Image Optimization: On Page SEO Basics
This post is a follow-up of last week post about SEO: On Page SEO: Semantic structure. I invite you to read this previous post as well. If you would like to have a whole picture of my SEO guide, you can check the series from the very first post: Comprehensive introduction to SEO.
The ALT Attribute
You should ALWAYS put some Alt attributes on your images. It must be a small description of the content of the image, or at least the Title of your article. This text is used for the visually disabled to know the content of a website and it is also displayed in the tooltip in Internet Explorer when your hover an image.
The TITLE Attribute
Do not mistake it for the Title Tag of your page. This attribute is used to define the links and the images. It is showed in the tooltip in FireFox and Chrome when you hover an image.
At the time when this report is written, it looks like it is ignored by Google and Yahoo but potentially used by Bing.
The File Name
If your website system does not automatically rename the files when you upload them, take good care of your filenames.
Name them with keywords linked with the image content, separate the keywords with dashes “-“ and don’t let any space between the words.
When possible, include a short caption above or under the image. Search Engines are analyzing the semantic context of the image to determine its content. This caption will help them understand the content of the image.
Tip: There is no form to get images indexed in Google Images, there is no Sitemap system for images, you have to wait for Google to index them automatically. But you can log into Google Webmaster Tools and manually activate the Image Search Function for a given site.
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