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Color Matching And Contrast . In visual perception of the real world, contrast is determined by the difference in the colour and brightness of the object and other objects within the same field of view.the human visual system is more sensitive to contrast than absolute luminance; Contrast requirements in wcag 2.0 are between text and background, but 1.4.11 requires contrast of at least 3:1 against adjacent color(s) which means you may need to measure contrast in more than one place. 31 Floor Vase Ideas For A Stylish Modern Home from www.decoist.com Contrast is the difference in luminance or colour that makes an object (or its representation in an image or display) distinguishable. In visual perception of the real world, contrast is determined by the difference in the colour and brightness of the object and other objects within the same field of view.the human visual system is more sensitive to contrast than absolute luminance; Contrast requirements in wcag 2.0 are between text and back...