SEO Optimization images is becoming increasingly more important in SEO (Seo optimization) for websites. The ALT attribute is a critical step that is sometimes forgotten. This is often a lost chance of better rankings.
In Google's webmaster guidelines, they advise using alternative text for that images in your web site:
Images:. Make use of the alt attribute to provide descriptive text. In addition, we recommend using a human-readable caption and descriptive text around the image.
Why would they ask us to achieve that? The answer is simple, really; search engines like google have a similar problem as blind users. They cannot begin to see the images.
Many webmasters and inexperienced or unethical SEOs abuse the use of this attribute, trying to stuff it with keywords, looking to achieve a particular keyword density, which isn't as relevant for rankings now since it was previously.
On the contrary, high keyword density can, on some search engines like google, trigger spam filters, which might result in a penalty for your site's ranking. Even without such a penalty, your site's rankings won't take advantage of this tactic.
This process also puts persons who use screen readers at a greater disadvantage. Screen readers are software-based tools that actually read aloud the contents of what's displayed on the screen. In browsing the web, the alt features of images are read aloud as well.
Imagine listening to a paragraph of text that is followed by repetitions of numerous keywords. The page would be far from accessible, and, to put it bluntly, would be found quite annoying.
What exactly is an Alt attribute?
An ALT attribute should not be used as a description or perhaps a label to have an image, though many people utilize it for the reason that fashion. Although it may appear natural to assume that alternate text is a label or a description, it's not!
The words used within an image's alt attribute ought to be its text equivalent and convey the same information or serve the same purpose that the image would.
The thing would be to provide the same functional information that the visual user would see. The alt attribute text should be the "stand in" when the look is not available. Ask yourself this question: If you were to replace the image with the text, would most users receive the same basic information, and wouldn't it create the same response?
A few examples:
Some SEO Optimization Tips
If a search button is really a magnifier or binoculars its alt text should be 'search' or 'find' not 'magnifying glass' or 'binoculars'.
If an image is supposed to convey the literal contents of the look, then a description is suitable.
If it is meant to convey data, then that data is what is appropriate.
If it's meant to convey using a function, then your function is what should be used.
Some Alt Attribute Guidelines:
Always add alt attributes to images. Alt is mandatory for accessibility and for valid XHTML.
For images that play merely a decorative role within the page, make use of an empty alt (i.e. alt="") or a CSS background image so that reading browsers do not bother users by uttering things like "spacer image".
Keep in mind that it's the function from the image we are trying to convey. For example; any button images shouldn't range from the word "button" within the alt text. They ought to emphasize the action performed through the button.
Alt text should be determined by context. The same image in a different context may require drastically different alt text.
Attempt to flow alt text with the rest of the text because that's how it is going to be read with adaptive technologies like screen readers. Someone listening to your page should hardly be aware that a graphic image can there be.
Please remember that using an alt attribute for every image is needed to meet the minimum WAI requirements, that are used as the benchmark for accessibility laws in UK and also the remainder of Europe. They are also necessary to meet "Section 508" accessibility requirements in america.
It is important to categorize non-text content into three levels:
Eye-Candy
Mood-Setting
Content and Function
I. Eye-Candy
Eye-Candy are things that serve no purpose other than to make a site visually appealing/attractive and (in many cases) satisfy the marketing departments. There is no content value (though there might be value to some sighted user).
Never alt-ify eye-candy unless there is something there which will enhance the usability of the site for someone utilizing a non-visual user agent. Use a null alt attribute or background images in CSS for eye-candy.
II. Mood-Setting
This is actually the middle layer of graphics which might serve to set the mood or set the stage so to speak. These graphics are not direct content and could not be considered essential, but they are essential in they help frame what's going on.
Try to alt-ify the 2nd group as makes sense and is relevant. There may be instances when doing so may be annoying or detrimental with other users. Then avoid it.
For example; Alt text that's identical to adjacent text is unnecessary, and an irritant to screen reader users. I suggest alt="" or background CSS images in such instances. But sometimes, it's important to get this content in there for those users.
Most times this will depend on context. The same image inside a different context may need drastically different alt text. Obviously, content ought to always be fully available. The way you use this example is really a judgment call.
III. Content and Function
This is where the image may be the actual content. Always alt-ify content and functional images. Title and long description attributes may also be so as.
The reason many authors can't understand why their alt text isn't working is they don't know why the images are there. You need to figured out exactly what function a picture serves. Consider what it's concerning the image that's important to the page's intended audience.
Every graphic includes a reason for standing on that page: because it either enhances the theme/ mood/ atmosphere or it is critical to what the page is trying to explain. Knowing what the look is perfect for makes alt text simpler to write. And exercise writing them definitely helps.
A way to check the usefulness of alternative text would be to imagine reading the page over the telephone to someone. An amount you say when encountering a specific image to create the page understandable towards the listener?
Besides the alt attribute you have a couple more tools available for images.
First, in degree of descriptiveness title is within between alt and longdesc. It adds useful information and may add flavor. The title attribute is optionally rendered by the user agent. Remember they're invisible and not shown as a "tooltip" when focus is received via the keyboard. (So much for device independence). So use the title attribute only for advisory information.
Second, the longdesc attribute points to the URL of a full description of the image. If the information found in a picture is important towards the meaning of the page (i.e. some important content would be lost when the image was removed), an extended description compared to "alt" attribute can reasonably display ought to be used. It can offer rich, expressive documentation of a visual image.
It should be used when alt and title are insufficient to embody the visual qualities of an image. As Clark [1] states, "A longdesc is a long description of an image...The goal is by using any period of description necessary to impart the facts of the graphic.
It wouldn't be remiss to hope that the long description conjures an image - the look - within the mind's eye, an analogy that holds true even for the totally blind."
Even though alt attribute is mandatory for web accessibility as well as for valid (X)HTML, not every images need alternative text, long descriptions, or titles.
In many cases, you are better off just choosing your gut instinct -- if it's not necessary to include it, and if you don't possess a strong urge to get it done, don't add that longdesc.
However, if it's essential for the entire page to operate, then you've to include the alt text (or title or longdesc).
What's necessary and what's not depends a lot on the function of the image and its context on the page.
Exactly the same image may need alt text (or title or longdesc) in one spot, but not in another. If the image provides absolutely no content or functional information alt="" or background CSS images may be appropriate to use. But if the image provides content or adds functional information an alt will be required and perhaps a long description will be in order. In many cases this kind of thing is a judgement call.
Image Seo optimization Tips
Listed below are key steps in optimizing images:
Choose a logical file name that reinforces the keywords. You should use hyphens in the file name to isolate the keyword, but avoid to exceeding two hyphens. Avoid using underscores as a word separator, such as "brilliant-diamonds.jpg";
Label the file extension. For example, if the image internet search engine sees a ".jpg" (JPEG) file extension, it's likely to assume that the file is really a photo, and when it sees a ".gif" (GIF) file extension, it's likely to assume that it is a graphic;
Ensure that the written text at the image that's relevant to that image.
Again, do not lose an excellent chance to help your website with your images searching engines. Begin using these steps to rank better on all of the engines and drive increased traffic for your site TODAY.