@Override
  public boolean equals(Object o) {
    return o instanceof ToonFilterTransformation &&
      ((ToonFilterTransformation) o).threshold == threshold &&
      ((ToonFilterTransformation) o).quantizationLevels == quantizationLevels;
  }
The threshold at which to apply the edges, default of 0.2.
The levels of quantization for the posterization of colors within the scene,
with a default of 10.0.
transformations/src/main/java/jp/wasabeef/glide/transformations/gpu/ToonFilterTransformation.java