How to convert RGB value to CMYK in javascript

Question

HI All

    Please provide the best way to convert the RGB value to CMYK value in java script.

Thanks in advance

Answer 1

function RGBtoCMYK(r,g,b){
        var result = new CMYK(0, 0, 0, 0);
        r = r / 255;
        g = g / 255;
        b = b / 255;
        result.k = Math.min( 1 - r, 1 - g, 1 - b );
        result.c = ( 1 - r - result.k ) / ( 1 - result.k );
        result.m = ( 1 - g - result.k ) / ( 1 - result.k );
        result.y = ( 1 - b - result.k ) / ( 1 - result.k );
        result.c = Math.round( result.c * 100 );
        result.m = Math.round( result.m * 100 );
        result.y = Math.round( result.y * 100 );
        result.k = Math.round( result.k * 100 );
        return result;
    }

    function CMYK(c, m, y, k) {
        if (c <= 0) { c = 0; }
        if (m <= 0) { m = 0; }
        if (y <= 0) { y = 0; }
        if (k <= 0) { k = 0; }
        if (c > 100) { c = 100; }
        if (m > 100) { m = 100; }
        if (y > 100) { y = 100; }
        if (k > 100) { k = 100; }
        this.c = c;
        this.m = m;
        this.y = y;
        this.k = k;
    }