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Snook colour contrast checker You can test foreground and background colour combinations with the Snook colour contrast checker. http://snook.ca/technical/colour_contrast/colour.html It gives you various results including whether the contrast passes various WCAG compliances. Example results: N.b. This is recommended by the BBC for their designers to ...


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Please use http://contrastchecker.com/ to check if the color combiantion of foreground(text) and background passes the WCAG criteria. Website lists 6 criteria for which you can check your combinations.


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The attribute you are looking for is “relative luminance,” L, which, for a standard monitor, can be calculated as: L = 0.2126 * Rg + 0.7152 * Gg + 0.0722 * Bg, Where Rg, Gg and Bg are R, G, B values transformed as follows: if R <= 10 then Rg = R/3294, else Rg = (R/269 + 0.0513)^2.4 if G <= 10 then Gg = G/3294, else Gg = (G/269 + ...


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According to the WCAG 2.0 web accessibility standards, the contrast for a text and background color should be a ratio of at least 4.5:1. Their checker shows your current background colors as being too light. I have taken screenshots of the differences: There is not enough contrast between the background color and the text. If the eye has to ...


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If you want to check the readability of text in contrast to the background use the following link - webaim.org/resources/contrastchecker It will allow you to easily identify whether there is enough contrast between the text and background to determine if people with visual impairments can read the text. It also helps with meeting Level AA (or AAA) ...


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I think you're a bit confused here. HSL stands for Hue, Saturation, Lightness. If you need to know white= 100% Lightness. So the opposite to white is still L, only that at 0% (thus if you use any value for H and S, then add 0% for the L value, you'll get black). You can see the w3 recommendations with examples here As for HSV, it's a bit more complex, ...


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Well, since you ask for it, here you have a very complete study with examples and a lot of data, another very conceptual study on what they call data hallucination , reference on Circadian clock. Keep in mind this is very technical information, and while very useful, maybe a bit overkill for your needs. Also, there's something that is not being considered ...


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F.lux has some information that may be relevant to this situation. F.lux is a software that overlays your desktop screen and adjusts colors depending on the time of day to make it easier on the eyes. f.lux research Blue Light Affects Sleep (and here's why) We know that night-time exposure to blue light keeps people up late. We believe that f.lux ...


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If you would like to use only flags for representation then you can try using grayscale images instead of using different color's it is legal to use grayscale images of flags of countries for print purpose.


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Changing the colors of the flags would be a breach of protocol/standard use, and it could be offensive to your users. For example, if you inadvertently changed the colors to those of a rival country, or to colors that had negative meanings in that culture. Instead of flags, use standard abbreviations for the language options, such as ENG for English, ESP ...



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