s up the rgb comparisons
      const data = imageData.data.map((_, i) => i % 4 === 3 ? 255 : Math.floor(256 * Math.random()))
      for (let i = 0; i < data.length; i++) {
        imageData.data[i] = data[i]
      }
      ctx.putImageData(imageData, 0, 0)

      return canvas
    }

    /**
     * Save an effect sample to the disk
     */
    async function saveSample(original, effect, path) {
      // Create movie (needed for layer to render)
      const movie = new etro.Movie({
        canvas: document.cr