Question

How can I convert RGB values into HTML code?

For example, using values like this:

red:0
blue:0
green:0
html color code = #000000

Is there any formula for converting it?

Answer 1

You just need to convert each component value to its corresponding hex representation, and concatenate them into a string, like:

function colorCode(red, green, blue) {
   red = normalize(red);
   green = normalize(green);
   blue = normalize(blue);

   return '#' + pad(red.toString(16)) + pad(green.toString(16)) + pad(blue.toString(16)); 
}

function pad(string) {
    return string.length > 1 ? string.toUpperCase() : "0" + string.toUpperCase();
}

function normalize(color) {
    return (color < 1.0 && color > 0.0) ? Math.floor(color * 255) : color;
}

Example: http://jsfiddle.net/5TdXJ/2