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This example of Alt Text is much better. It describes many details in the image so that the reader has a better idea of what is in the picture. |
Section 6.2: Long Descriptions for Complex Images, Pie Charts, and Bar Graphs
When using complex images like pie charts or bar graphs, it is better to use a long description rather than Alt Text. Alt Text is meant to be brief, while long descriptions give you a bit more freedom to explain the image. There are many ways to create a long description including:
Describing the complex image in text below the image.
Adding a link below the complex image.
Providing the data from the image in text form.
Make sure the long description is visible to all users. Even if they are links, or buttons.
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This pie chart is missing a long description. This will be an issue to readers who cannot see at all or can see very little. |
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This pie chart is now accessible due to it having a link. The link will take the reader to a long description or index when clicked. |
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This pie chart contains a long description that tells the screen reader and reader exactly what is on the pie chart. This will make it much easier for the reader to understand the chart, and the statistics, and learn at a faster pace. |
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This pie chart is also accessible because it provides Alt Text directing the readers attention from the pie chart to the table. A reader may have a difficult time reading a pie chart, to remedy this, create a table underneath the chart with the same information. This will give them the ability to get the information they need. |
Additional Types of Long Descriptions
When you use complex images, you must describe it using Alt Text and have a longer description.
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This image of the Hagia Sophia in Turkey has an Alt Text. However, there is no long description. |
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This image of the Hagia Sofia has an alt text. There is also a link to the long description that will go into more detail about what is in the picture. |
Section 6.3: Watermarks and Backgrounds
Watermarks and background images should not be used. They will interfere with peoples ability to read the page. Watermarks and backgrounds tend to be very distracting to most readers. It is best to use a background that does not interfere much at all with the text on the slide.
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This background does not interfere with the text and gives the PowerPoint a very professional look. |
Section 6.
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4: Text Boxes, Shapes, and Other Floating Objects
PowerPoint differs from Word in one very significant way: floating objects are easy to navigate and make up the very nature of the entire slide. The title field in a slide, for instance, is a text box. Users just needs to hit the tab button to navigate slide and each object will be selected, announced, and the alt text (if present) will be read.
You do not need to add alt text to text boxes, since the contents are directly read by a screen reader, but you MUST add alt text to other non-text objects, including shapes and icons (and of course, images, graphs, charts, etc.).
Section 6.
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5: Using a Series of Shapes
A series of the same shapes or images should be grouped. They should also be given alternative text and a long description. You can group them together by right clicking each of the shapes and pressing Control G.
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