blend_mode_destination.jpeg is an original photograph of Berkeley
taken from near the Lawrence Hall of Science in 2015 by Ian Hickson,
and is hereby provided under the following license:
Copyright 2015 The Chromium Authors. All rights reserved. Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
blend_mode_source.png was obtained from
https://www.1001freedownloads.com/free-clipart/blue-macaw-2 which
claims the photo is called Blue Macaw, the graphic is by
Luchapress, and that it is licensed under the CC0 1.0 Universal
(CC0 1.0)
License.