text: export const Sepia = function (imageData) {
      var data = imageData.data, nPixels = data.length, i, r, g, b;
      for (i = 0; i < nPixels; i += 4) {
          r = data[i + 0];
          g = data[i + 1];
          b = data[i + 2];
          data[i + 0] = Math.min(255, r * 0.393 + g * 0.769 + b * 0.189);
          data[i + 1] = Math.min(255, r * 0.349 + g * 0.686 + b * 0.168);
          data[i + 2] = Math.min(255, r * 0.272 + g * 0.534 + b * 0.131);
      }
  };
  