SEO Optimization images has become more and more essential in SEO (Search Engine Optimization) for websites. The ALT attribute is really 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 the images on your site:
Images:. Use the alt attribute to provide descriptive text. Additionally, we recommend utilizing a human-readable caption and descriptive text round the image.
Why would they ask us to do that? The answer is easy, really; search engines like google have the same problem as blind users. They cannot begin to see the images.
Many webmasters and inexperienced or unethical SEOs abuse using this attribute, trying to stuff it with keywords, looking to achieve a certain keyword density, which is not as relevant for rankings now since it was previously.
On the contrary, high keyword density can, on some search engines, trigger spam filters, which might create a penalty for your site's ranking. Even without this type of penalty, your site's rankings will not benefit from this plan.
This method also puts persons who use screen readers at a greater disadvantage. Screen readers are software-based tools that really read aloud the items in what's displayed on the screen. In browsing the web, the alt attributes of images are read aloud as well.
Imagine listening to a paragraph of text which is then repetitions of many keywords. The page would be far from accessible, and, to put it mildly, will be found quite annoying.
What exactly is an Alt attribute?
An ALT attribute should not be used as a description or a label for an image, though many people use it for the reason that fashion. Although it might seem natural to assume that alternate text is a label or a description, it's not!
The words used inside an image's alt attribute should be its text equivalent and convey the same information or serve the same purpose that the image would.
The thing is to provide the same functional information that the visual user would see. The alt attribute text should be the "stand in" when the look itself is not available. Ask yourself this question: Should you replace the look using the text, would most users get the same basic information, and would it generate the same response?
A few examples:
If a search button is really a magnifying glass or binoculars its alt text should be 'search' or 'find' not 'magnifying glass' or 'binoculars'.
If an image is supposed to convey the literal items in the look, then a description is appropriate.
If it's designed to convey data, then that data is what is appropriate.
If it's meant to convey the use of a function, then your function itself is what ought to 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 only 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 such things as "spacer image".
Keep in mind that it is the function from the image we are trying to convey. For instance; 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 ought to be determined by context. The same image in a different context may need drastically different alt text.
Try to flow alt text with the rest from the text because that is how it is going to be read with adaptive technologies like screen readers. Someone hearing your page should hardly be aware that a graphic image can there be.
Please keep in mind that using an alt attribute for each image is needed to satisfy the minimum WAI requirements, that are used since the benchmark for accessibility laws in UK and 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) fulfill the marketing departments. There is no content value (though there might be value to some sighted user).
Never alt-ify eye-candy unless there's something there which will boost the usability of the site for someone utilizing a non-visual user agent. Make use of a null alt attribute or background images in CSS for eye-candy.
II. Mood-Setting
This is actually the middle layer of graphics which may actually set the atmosphere or set the stage so to speak. These graphics are not direct content and may not be considered essential, but they're important in they help frame what is going on.
Attempt to alt-ify the 2nd group as is sensible and is relevant. There might be instances when doing so may be annoying or detrimental with other users. Then try to avoid it.
For example; Alt text that's identical to adjacent text is unnecessary, as well as an irritant to screen reader users. I recommend alt="" or background CSS images in such instances. But sometimes, it's vital that you understand this content inside for those users.
Usually this will depend on context. The same image in a different context may require drastically different alt text. Obviously, content ought to always be fully available. The way you go in this case is a judgment call.
III. Content and Function
This is when the look 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 that they don't know why the pictures are there. You have to determined precisely what function an image serves. Think about what it is concerning the image that's vital that you the page's intended audience.
Every graphic includes a reason behind standing on that page: because it either improves the theme/ mood/ atmosphere or it is critical to what are the page is trying to explain. Understanding what the image is perfect for makes alt text simpler to write. And practice writing them definitely helps.
A way to check the usefulness of alternative text is to imagine reading the page on the phone to someone. What would you say when encountering a particular image to make the page understandable to the listener?
Aside from the alt attribute you have a couple more tools at your disposal for images.
First, in degree of descriptiveness title is in 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 never shown as a "tooltip" when focus is received via the keyboard. (A lot for device independence). So use the title attribute only for advisory information.
Second, the longdesc attribute points towards the URL of a full description of an image. When the information found in an image is essential towards the concept of the page (i.e. some important content would be lost if the image was removed), a longer description than the "alt" attribute can reasonably display ought to be used. It may offer rich, expressive documentation of the 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 really a long description of the image...The goal is to use any period of description necessary to impart the details from the graphic.
It wouldn't be remiss to hope that a long description conjures an image - the look - in the mind's eye, an analogy that is true even for the totally blind."
Even though alt attribute is mandatory for web accessibility as well as for valid (X)HTML, not all images need alternative text, long descriptions, or titles.
Oftentimes, you are better off just choosing your gut instinct -- if it's not essential to incorporate it, and if you don't possess a strong urge to do it, don't include that longdesc.
However, if it's necessary for the whole 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 about the function of your image and it is context about the page.
Exactly the same image may need alt text (or title or longdesc) in a single spot, although not in another. If an image provides absolutely no content or functional information alt="" or background CSS images may be appropriate to use. However, if the image provides content or adds functional information an alt would be required and perhaps even a long description would be so as. Oftentimes this kind of thing is really a judgement call.
Listed here are key steps in optimizing images:
Choose a logical file name that reinforces the keywords. You should use hyphens within 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 instance, when the image search engine sees a ".jpg" (JPEG) file extension, it's going to assume that the file is a photo, and if it sees a ".gif" (GIF) file extension, it's likely to assume that it is graphic;
Ensure that the text nearby the image that is relevant to that image.
Again, don't lose an excellent opportunity to help your website together with your images in search engines. Begin using these steps to position better on all of the engines and drive more traffic for your site TODAY.
