What worked well over an initial image doesn't work so well over the new one. The same holds true for various fonts with varying stroke widths, character widths, font complexity, etc. To properly test color and contrast issues you will need some way to accurately compare colors as can be done by following the instructions later in this document for "Installing the Colour Contrast Analyser" and using it.Īnother reason for being more inclusive with contrast is that text over images contrast is often created with a specific image or images in mind for which the contrast ratios work "perfectly" but then someone else comes along and substitutes a new image or two and suddenly the contrast ratios do not work. For example, while it is technically possible to have some shades of green background on which white and black letters both exceed the minimum contrast ratio by a bit practically all users will likely find either the black or the white harder to read than the other. The official contrast computation rules are not particularly perfect since they make some assumptions about green and/or hue that don't actually precisely track contrast recognition even in individuals without vision issues. Usually there will not be so try to think more inclusively and meet or exceed even the AAA minimums. While the official minimums for AA are an absolute minimum MSU requirement it is best to also remember that MSU has a broad MSU inclusion policy so if you find yourself tweaking something to just hit the AA minimum you probably ought to stop and ask yourself if there is any justification for hitting the bare minimum. However, it is important to make sure that fonts and images have a sufficient contrast or use other mechanisms to help visually impaired users understand the content.
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