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What is an acceptable contrast ratio between a foreground and its background?

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Is this question about websites or printed materials or just generally? I suspect the answer varies by the type of design. – Computerish Jan 4 '11 at 21:35
In what context? It's all about context. – DA01 Jan 25 '12 at 23:05

If this is for web, I typically use Jonathan Snook's Color Contrast Checker. The safe ratio is about 7.5

Roger Johansson has a nice blog post about varies contrast checking tool, check it out.

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Not that that is specific to text/background color contrast. – DA01 Jan 25 '12 at 23:06

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