I am creating my own PHP based application where i want to change RGB color into xy format of CIE 1931.
How can i convert my RGB color specs to the CIE color space?
Here is my Javascript version. It should help you enough ;)
/**
* Convert RGB to XY
*/
function RGBtoXY(red,green,blue){
red = (red > 0.04045) ? Math.pow((red + 0.055) / (1.0 + 0.055), 2.4) : (red / 12.92);
green = (green > 0.04045) ? Math.pow((green + 0.055) / (1.0 + 0.055), 2.4) : (green / 12.92);
blue = (blue > 0.04045) ? Math.pow((blue + 0.055) / (1.0 + 0.055), 2.4) : (blue / 12.92);
var X = red * 0.664511 + green * 0.154324 + blue * 0.162028;
var Y = red * 0.283881 + green * 0.668433 + blue * 0.047685;
var Z = red * 0.000088 + green * 0.072310 + blue * 0.986039;
var fx = X / (X + Y + Z);
var fy = Y / (X + Y + Z);
return [fx.toPrecision(4),fy.toPrecision(4)];
}