@Override
  public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {
    messageDigest.update((ID + contrast).getBytes(CHARSET));
  }
contrast value ranges from 0.0 to 4.0, with 1.0 as the normal level
transformations/src/main/java/jp/wasabeef/glide/transformations/gpu/ContrastFilterTransformation.java