Alternate Text and Decorative Images in PowerPoint

Today’s post focuses on alternative text and decorative images in PowerPoint. Images need accurate descriptions for students who rely on screen readers.

Video Guide

General Tips for Alternate Text in PowerPoint

Avoid using text-heavy photos and the description should provide enough information within the context of the topic. Keep in mind the context of the picture, which may change the scope of the needed explanation.

Images should never start with a “picture of” or “image of” as the screen reader will identify it as an image. The one exception to this rule is if the context of that information actually matters. Is this a photography course? Is this an art course? If so, then it might be ok to use “image of” in the description.

Image Context

Image context will change based on the audience and what you want them to learn about the image. The same image could have different descriptions depending on its intent.

Special Notes

Check all images carefully, as the file name can sometimes end up in the alternate text area. For instance, the alt text area for an image might contain a default value like “jordison.png.” Make sure to spot-check all images to confirm that the file name hasn’t been inserted.

Keep alternate text less than 100 – 150 characters. If there is more text needed – be sure to include it next to the image on the page. You can also link to a longer description using a separate document!

When do I mark an image decorative?

Mark images as decorative when they don’t convey any meaning or are used purely for visual effect. After selecting the image and opening the Alt Text panel, select the checkbox “Mark as decorative”. This has the effect of making the image “invisible” to assistive technologies.

If an image lacks alternate text and isn’t marked as decorative, assistive technologies may read out the file name or announce a graphic’s presence without providing further details. This situation signals to the student that content might exist, but they can’t access that information.

If sufficient information is described through text and images are used, consider marking the graphics as decorative to improve screen reader readability. 

How to apply alternate text to images in PowerPoint

1. Right click the image
2. Then, select Edit Alt text

Then, enter a description.

1. Enter an engaging alternate text description,
2. Or, mark as decorative

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