Yes, content is king - well GOOD content is king, but photos and pictures as well as video all are playing a huge factor in optimizing websites and blogs now. We cannot sit by and simply write, we must allow for eye-catching photos and let the search engines know it.
It's true that search engines and computers cannot see images. They know its an image by the code behind it but unless you tell them what it's a picture of, they have no idea and therefore don't take it into consideration when ranking your page or post.
You must tell the search engines what it is they are looking at so they can rank the pictures just as much as the text itself. People obviously don't like staring at a page of black and white characters for too long. We must break that monotony up with graphics, heading tags and video if we can. We need to keep the people on the page as long as possible and if it means clicking a 2 minute video, studying a unique photo or dwelling on a creative thought, then we must offer what the people want.
It's actually very easy to optimize a graphic in just about any format or platform but you have to know where and how. Most blogging platforms will allow you to put in an image title and description [follow link to know the difference]. Some may just allow for a description or the ALT TAG. This is where you tell the search engines what the photo or image is. This is also where you optimize the graphic. If there is no place to do this, you will need to add it manually in the code.
Manually adding an image TAG:
Click over to the "source" or "HTML" and find this code alt "" after the image code. You will want to add your description or TAG between the two quotes.
Example: If I am doing a piece on Montana Ranches and I have a picture of a Montana ranch, I will make sure the alt tag is "Montana Ranches" I will add that text between the quotes- (Capitalization is not that important here).
Link the photo:
For more optimization, link the photo to an additional page on your website about that topic. Just like I did with the image below:
I have tagged it as a Montana Ranch, linked it to the Montana ranch page on the website and added the TITLE: "check out more Montana Ranches" . Now this image screams Montana Ranches and will solidify the entire piece as more of an authority on the subject. (To LINK an image: click on the image and click the link icon just as if you were linking a phrase or word in your post)
If you want to be the authority for your area and your business, you must optimize every piece of your blog post or page. Don't just throw out a blog for the sake of it. Make every one count if you want to be found for it.
Tom Arstingstall did a great piece on this last week with a little more details.