All of the features of the GVSU CMS are built with color contrast in mind. However, the CMS cannot determine if a user uploaded image has adequate color contrast. Visual presentations and images need to maintain a minimum contrast ratio of at least 4.5:1. The contrast ratio cannot be round up to 4.5:1 if it is close. For example, white text on a commonly-used shade of gray (#777777) has a 4.47:1 contrast ratio and does not meet the minimum contrast ratio requirement

The following are exceptions to the color contrast ratio requirement:

• Large Text:  Large-scale text needs to have a contrast ratio of at least 3:1.
• Incidental: Text or images that are pure decoration, that are not visible to anyone, or that are part of a picture that contains significant other visual content, have no contrast requirement.
• Logos: Text that is part of a logo or brand name has no contrast requirement.

There is no one "best" tool for testing color contrast. The tools that you use will depend on your personal preference and the type of content being that is evaluated, however, the following are recommended tools:

• WebAIM: Contrast Checker - presents the contrast difference between two colors, and will help you identify a color that meets the desired level of contrast.
• Contrast Ratio - Contrast Ratio: Easily calculate color contrast ratios. As you type, the contrast ratio indicated will update. Passing WCAG was never this easy!