Use of Color and Contrast Minimum (MS PowerPoint)
People who cannot differentiate between certain colors and those using monochrome displays and printers may not be able to see information conveyed solely with color. For example, if red is used as the sole means of denoting high priority content then people with color-blindness may not be able to identify high priority content.
Similar to the problem of using color as the only way to convey information, content authors need to be sure that there is sufficient color contrast between the foreground and the background of their content. Without sufficient contrast, people who are visually impaired may have a very difficult time seeing the content in a document.
The Purpose of this checkpoint is twofold: First, to identify any information that is conveyed solely through the use of color and to ensure that the content is being conveyed some other way. Second, to verify that there is sufficient contrast between the content and the background of the document.
Important Note: The U.S. Department of Health and Human Services (HHS) and WCAG 2.0 specify that there should be a minimum contrast ratio between foreground text and background color of 4.5:1. Go to the webpage on how to meet the WCAG 2.0 checkpoint 1.4.3 for additional information on how to satisfy the color contrast requirements.
- The slides in the presentation that use color and therefore may potentially have color issues will be listed in the CommonLook Office GlobalAccess panel. Select the first slide in the list.
- Click the “Show Filter” button to display a filter that removes color.
- Click and hold on the filter to drag it over the slide, identifying any information may be conveyed solely through color use (for example, charts where color is the only means of identifying distinct data sets).
- If it is determined that information is conveyed solely by color, then edit the content of the slide until all such information is also conveyed using other means (for example, with a textual description). (Note: This step is not depicted in the screen shot below.)
- Click the arrow to the right of “Task” to continue verifying the other slides in the presentation.
This checkpoint is relevant to the following regulations, guidelines and standards:
|Section 508 – 2001 Regulations (USA)||2001||“Web-Based Information & Applications”||(c)|
|W3C WCAG 2.0||2008||Web Content||SC 1.4.1|
|Health and Human Services – HHS (USA)||2013||PDF File 508 Checklist||ID 1.13|
|ISO 14289 (PDF/UA)||2012||PDF Technology||Section 7.1|