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Re: Colour contrast and blue light filters

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From: Jonathan Avila
Date: Jan 31, 2019 7:30AM

This is an interesting question and one that also comes up with invert colors as that changes the contrast ratios as well. From my experience with blue light filters is that they are a spectrum that the user can specify and typically remove blues and warm the colors with more reddish colors. So I'd imagine it would impact contrast of colors that have more blue in them -- but this only a guess since I am not an expert in color.

Testing could be difficult if the filter is applied in such a way that the contrast tools can't get the value. You may need to apply the filter values to the colors first and then run them through a contrast checker -- depending on the configuration. There are both browser and platform level blue light filters so they may work differently.

Jonathan

Jonathan Avila
Chief Accessibility Officer
Level Access
<EMAIL REMOVED>
703.637.8957 office

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