Accessible PDFs: PowerPoint Slides with Graphs and Complex Images

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I have converted a PowerPoint with complex graphs and images to PDF and am in the process of making sure it continues to be accessible. Is there a reference of examples on how to handle these particulars for PDF? WCAG 2.0 AA mainly relates to html and using long description which leads to another page with text about the image. How do you handle something with a long complex description in PDF (or any other document other than HTML)? It is my understanding that a screen reader will only read the first 120-140 characters of the alt text and it will take more than that to describe my graphs or 1 of the images. I wish I could upload it so you can see my problems.

I would also like a PDF reference for what a graph should look like in the tag tree. It doesn't seem like it would be easy to follow with a screen reader and that the blind would have to depend on the summary in the alt text and couldn't get the details of the graph. If that is the case, wouldn't we need to put all of the numbers in the alt text and then we run into the same character limitation problems. 
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Aricia

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  • frustrated.

Posted 2 years ago

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Sheryl, Official Rep

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Hi Aricia

The W3C do have PDF techniques for WCAG2 that you might find useful: https://www.w3.org/TR/WCAG-TECHS/pdf.html

As for providing graphs, etc you will want to provide a long description as you would on a web page. Information can be found in Understanding SC 1.1.1 https://www.w3.org/WAI/WCAG21/Understanding/non-text-content.html

If you would like further help, feel free to contact us directly at enquiries@accessibilityoz.com

Kind regards
Sheryl
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Aricia

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Thank you for the references. However, they do not answer my specific questions. I have a PDF document that has some complex graphs. Am I supposed to provide a separate document that describes the graphs with tables of the data? Or am I supposed to provide a web page with this information? 

At this time, my administration is reluctant to outsource this work and I would like to find out the answer to how to handle the situation.
Thank you.
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Sheryl, Official Rep

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Hi Aricia

I'm sorry if I was not clear in my previous comment. A long description does not need to be a separate webpage or document but you do need to have a full description of the purpose of the graph, map, etc that is not able to be contained in the alt text. Meaning, you need to provide a paragraph or two. This can be after the graph, etc - or accessibly as a footnote. The links I provided will help to give accessible ways of managing this, alternatively, we are able to help provide assistance. 

I hope this cleared the issue for you.

Kind regards
Sheryl