Images test
From SiteRay wiki
| SiteRay Test | |
|---|---|
| First appeared: | Sitescore 1.0 |
| Applies to: | All versions |
| Type: | Individual test |
| Scored: | Always |
What does it do?
Test the use of images – whether they are used, how widely used and whether they are specified correctly.
Why is it important?
This test looks for the use of unique imagery per page. Generally, there is a positive correlation between appropriate use of imagery and a user's opinion of a website.
In addition, images are tested to see whether they use explicitly-defined sizes. Not defining the size of an image in advance can make pages 'jump around' as they are loading, and in some cases this may represent inappropriate use of images.
Example results
How is it measured?
Sitescore runs through each page in turn, and as it goes it makes a note whenever a new image is encountered. Typically the homepage is filled with lots of new images (i.e. every image it finds is new), subsequent pages will tend to repeat some images such as logos and common brand elements.
Images are also checked to see whether they have explicitly defined sizes (as is best practice).
The score is based on the number of average images per page and the percentage of images with explicitly defined sizes. The calculation varies depending on the size of the website, in general websites can score maximum if they use 2 – 3 unique images per page and always define image sizes.
Technical explanation
When checking image sizes, both HTML attributes (width, height) and CSS styles are tested – either is acceptable. Similarly, images include those applied using an <img> tag, backgrounds, and those applied via CSS. Images are classed as unique based on their URL only – the contents of the image are not considered.
Common problems
This test is particularly subjective and may be considered inappropriate for some websites. It deliberately has a very low effect on the overall Sitescore as a result. It remains a useful indicator of the broad visual appeal of most websites – i.e. is this website likely to look interesting, or extremely dry and repetitive.
How to improve this score
Consider using a selection of appropriate imagery throughout the website to add visual appeal. Most user groups respond well to appropriate imagery, tastefully used.
Ensure all images define an explicit size (this is a technical issue, but there is very little excuse with modern web software why this is not possible).
How to use this test effectively
This test gives an at-a-glance indicator of whether there is likely to be enough image variety in the website. It should be taken as a subjective indicator, as websites have different requirements.
