color-fns/dist/lib/rgbToCmyk.js

Modern JavaScript color utility library.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var parseRgb_1 = require("./parseRgb");
function rgbToCmyk(rgb) {
    var value = typeof rgb === 'string' ? parseRgb_1.parseRgb(rgb) : rgb;
    if (!value) {
        return null;
    }
    // Convert the RGB values to the range 0-1
    var _a = [value.red / 255, value.green / 255, value.blue / 255, value.alpha], red = _a[0], green = _a[1], blue = _a[2], alpha = _a[3];
    // Find the maximum value of R, G and B.
    var max = Math.max(red, green, blue);
    // Calculate the cmyk values
    var key = 1 - max;
    var cyan = (1 - red - key) / (1 - key);
    var magenta = (1 - green - key) / (1 - key);
    var yellow = (1 - blue - key) / (1 - key);
    // normalize values
    cyan = Math.floor(cyan * 100);
    magenta = Math.floor(magenta * 100);
    yellow = Math.floor(yellow * 100);
    key = Math.floor(key * 100);
    return {
        alpha: typeof alpha !== 'undefined' ? alpha : 1,
        cyan: cyan,
        key: key,
        magenta: magenta,
        yellow: yellow
    };
}
exports.rgbToCmyk = rgbToCmyk;
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