That generator is written on zsh and is aimed only to deal with JPEG XL
and WebP image formats solely. JPEG XL is superior to any other format
-both in lossy and lossless modes. The only exception is screenshots
-encoded in lossless WebP (VP8L) format.
+both in lossy and lossless modes. WebP just can not be losslessly
+transcoded to JPEG XL, so it is left for backward compatibility.
Just run that script inside the directory with .jxl/.webp files. For
each file the small preview will be generated in lossy WebP format. Also
included on the first page.
Following external utilities are called: djxl, jxlinfo, exiftool,
-pamtopng, pnmscale, pngcrush, advpng, webpinfo, dwebp, cwebp.
+pamtopng, pnmscale, pngcrush, advpng, webpinfo, dwebp, cwebp, parallel.