2018.10.14 15:50 "[Tiff] Zstd and WebP compression in TIFF", by Bob Friesenhahn
The next libtiff release will support Zstd and WebP compression options. The next GraphicsMagick release will support these options. My experience with both of these compression algorithms in libtiff is quite pleasing.
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/