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jQuery color contrast

The purpose of this plugin

Defining the text color by using the background-color or background-image colors as a reference. To do so we use the function defined by the WAI working group:

(This is a suggested algorithm that is still open to change.) Two colors provide good color visibility if the brightness difference and the color difference between the two colors are greater than a set range.

Color brightness is determined by the following formula: ((Red value X 299) + (Green value X 587) + (Blue value X 114)) / 1000 Note: This algorithm is taken from a formula for converting RGB values to YIQ values. This brightness value gives a perceived brightness for a color.

Source: W3 WAI working group - Techniques For Accessibility Evaluation And Repair Tools