Calculate luminosity of a given #RRGGBB string.
#RRGGBB
Also ported to ContrastRatioValidator.php.
ContrastRatioValidator.php
http://www.w3.org/TR/WCAG20/#relativeluminancedef
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Calculate luminosity of a given
#RRGGBB
string.Also ported to
ContrastRatioValidator.php
.http://www.w3.org/TR/WCAG20/#relativeluminancedef