Yes, there are specific color contrast rules for accessible signage in Canada, primarily guided by the CSA B651 accessibility standards. These rules ensure that signage is legible for individuals with low vision by focusing on the difference in light reflectance between text and its background.
Key rules and specifications include:
- Minimum Contrast Ratio: The standards mandate a minimum of 70% luminance contrast between tactile characters and their background.
- Finish Requirements: Signs must have a non-glare or matte finish to prevent reflections from obscuring the text.
- Verified Luminance: Effective contrast is determined by light reflectance values rather than just different hues. High-visibility pairings are recommended to exceed the minimum requirements, such as:
- Black text on a white background (can yield over 90% contrast).
- White text on a black background.
- Yellow text on a dark blue background.
- Character Style: To maintain visual clarity, signs must use sans-serif, uppercase characters.
While brand colors can often be incorporated, they must be selected carefully to ensure the measurable 70% contrast threshold is maintained for full compliance.
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