Color Contrast Checker

Contrast Ratio Analyser Colour Contrast The old Accessibility Evaluation and Repair Tools (AERT) suggested algorithm for determining colour contrast now directs here. The AERT algorithm was never a recommendation, and WCAG 2.0's luminosity contrast algorithm is recommended instead. Success Criterion 1.4.3 of WCAG 2.0 requires the visual presentation of text and images of text has a contrast ratio of at least 4.5:1, except for the following: Large Text: Large-scale text and images of large-scale text have a contrast ratio of at least 3:1; Incidental: Text or images of text that are part of an inactive user interface component, 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. Analyse Luminosity Contrast Ratio

Contrast Analyser & Accessibility About the Colour Contrast Analyser This native application (available for both Windows and Mac) allows you to evaluate the color visibility and contrast of foreground/background color combinations. It provides an initial pass/fail assessment against WCAG 2.0 color contrast success criteria. In addition, the Colour Contrast Analyser provides functionality to simulate certain visual conditions such as dichromatic color blindness (protanopia, deuteranopia, tritanopia) and cataracts. Details The Color Contrast Analyser was developed to facilitate the assessment of color combinations against WCAG 2.0: The Colour Contrast Analyser uses the following formula to determine contrast: where R, G and B are defined as: if RsRGB <= 0.03928 then R = RsRGB/12.92 else R = ((RsRGB+0.055)/1.055) ^ 2.4if GsRGB <= 0.03928 then G = GsRGB/12.92 else G = ((GsRGB+0.055)/1.055) ^ 2.4if BsRGB <= 0.03928 then B = BsRGB/12.92 else B = ((BsRGB+0.055)/1.055) ^ 2.4 and RsRGB, GsRGB, and BsRGB are defined as: Versions Windows