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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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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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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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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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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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