question: public static float computeContrastBetweenColors ( int bg , int fg ) { float bgR = Color . red ( bg ) / 255f ; float bgG = Color . green ( bg ) / 255f ; float bgB = Color . blue ( bg ) / 255f ; bgR = ( bgR < 0.03928f ) ? bgR / 12.92f : ( float ) Math . pow ( ( bgR + 0.055f ) / 1.055f , 2.4f ) ; bgG = ( bgG < 0.03928f ) ? bgG / 12.92f : ( float ) Math . pow ( ( bgG + 0.055f ) / 1.055f , 2.4f ) ; bgB = ( bgB < 0.03928f ) ? bgB / 12.92f : ( float ) Math . pow ( ( bgB + 0.055f ) / 1.055f , 2.4f ) ; float bgL = 0.2126f * bgR + 0.7152f * bgG + 0.0722f * bgB ; float fgR = Color . red ( fg ) / 255f ; float fgG = Color . green ( fg ) / 255f ; float fgB = Color . blue ( fg ) / 255f ; fgR = ( fgR < 0.03928f ) ? fgR / 12.92f : ( float ) Math . pow ( ( fgR + 0.055f ) / 1.055f , 2.4f ) ; fgG = ( fgG < 0.03928f ) ? fgG / 12.92f : ( float ) Math . pow ( ( fgG + 0.055f ) / 1.055f , 2.4f ) ; fgB = ( fgB < 0.03928f ) ? fgB / 12.92f : ( float ) Math . pow ( ( fgB + 0.055f ) / 1.055f , 2.4f ) ; float fgL = 0.2126f * fgR + 0.7152f * fgG + 0.0722f * fgB ; return Math . abs ( ( fgL + 0.05f ) / ( bgL + 0.05f ) ) ; }
target:  Calculates the constrast between two colors, using the algorithm provided by the WCAG v2.