- https://developers.google.com/speed/webp/docs/compression#lossless_webp
- https://developers.google.com/speed/webp/docs/webp_lossless_bitstream_specification
*. [#l886bcd6]
- WebP Lossless はちゃんと Lossless してます
-- https://qiita.com/yoya/items/a000c2e123d448a37f47
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