text: (function() {
    'use strict';
    Konva.Factory.addGetterSetter(
      Konva.Node,
      'hue',
      0,
      Konva.Validators.getNumberValidator(),
      Konva.Factory.afterSetFilter
    );
    /**
     * get/set hsv hue in degrees. Use with {@link Konva.Filters.HSV} or {@link Konva.Filters.HSL} filter.
     * @name hue
     * @method
     * @memberof Konva.Node.prototype
     * @param {Number} hue value between 0 and 359
     * @returns {Number}
     */
  
    Konva.Factory.addGetterSetter(
      Konva.Node,
      'saturation',
      0,
      Konva.Validators.getNumberValidator(),
      Konva.Factory.afterSetFilter
    );
    /**
     * get/set hsv saturation. Use with {@link Konva.Filters.HSV} or {@link Konva.Filters.HSL} filter.
     * @name saturation
     * @method
     * @memberof Konva.Node.prototype
     * @param {Number} saturation 0 is no change, -1.0 halves the saturation, 1.0 doubles, etc..
     * @returns {Number}
     */
  
    Konva.Factory.addGetterSetter(
      Konva.Node,
      'luminance',
      0,
      Konva.Validators.getNumberValidator(),
      Konva.Factory.afterSetFilter
    );
    /**
     * get/set hsl luminance. Use with {@link Konva.Filters.HSL} filter.
     * @name value
     * @method
     * @memberof Konva.Node.prototype
     * @param {Number} value from -1 to 1
     * @returns {Number}
     */
  
    /**
     * HSL Filter. Adjusts the hue, saturation and luminance (or lightness)
     * @function
     * @memberof Konva.Filters
     * @param {Object} imageData
     * @author ippo615
     * @example
     * image.filters([Konva.Filters.HSL]);
     * image.luminance(200);
     */
  
    Konva.Filters.HSL = function(imageData) {
      var data = imageData.data,
        nPixels = data.length,
        v = 1,
        s = Math.pow(2, this.saturation()),
        h = Math.abs(this.hue() + 360) % 360,
        l = this.luminance() * 127,
        i;
  
      // Basis for the technique used:
      // http://beesbuzz.biz/code/hsv_color_transforms.php
      // V is the value multiplier (1 for none, 2 for double, 0.5 for half)
      // S is the saturation multiplier (1 for none, 2 for double, 0.5 for half)
      // H is the hue shift in degrees (0 to 360)
      // vsu = V*S*cos(H*PI/180);
      // vsw = V*S*sin(H*PI/180);
      //[ .299V+.701vsu+.168vsw    .587V-.587vsu+.330vsw    .114V-.114vsu-.497vsw ] [R]
      //[ .299V-.299vsu-.328vsw    .587V+.413vsu+.035vsw    .114V-.114vsu+.292vsw ]*[G]
      //[ .299V-.300vsu+1.25vsw    .587V-.588vsu-1.05vsw    .114V+.886vsu-.203vsw ] [B]
  
      // Precompute the values in the matrix:
      var vsu = v * s * Math.cos(h * Math.PI / 180),
        vsw = v * s * Math.sin(h * Math.PI / 180);
      // (result spot)(source spot)
      var rr = 0.299 * v + 0.701 * vsu + 0.167 * vsw,
        rg = 0.587 * v - 0.587 * vsu + 0.33 * vsw,
        rb = 0.114 * v - 0.114 * vsu - 0.497 * vsw;
      var gr = 0.299 * v - 0.299 * vsu - 0.328 * vsw,
        gg = 0.587 * v + 0.413 * vsu + 0.035 * vsw,
        gb = 0.114 * v - 0.114 * vsu + 0.293 * vsw;
      var br = 0.299 * v - 0.3 * vsu + 1.25 * vsw,
        bg = 0.587 * v - 0.586 * vsu - 1.05 * vsw,
        bb = 0.114 * v + 0.886 * vsu - 0.2 * vsw;
  
      var r, g, b, a;
  
      for (i = 0; i < nPixels; i += 4) {
        r = data[i + 0];
        g = data[i + 1];
        b = data[i + 2];
        a = data[i + 3];
  
        data[i + 0] = rr * r + rg * g + rb * b + l;
        data[i + 1] = gr * r + gg * g + gb * b + l;
        data[i + 2] = br * r + bg * g + bb * b + l;
        data[i + 3] = a; // alpha
      }
    };
  })();
  