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
corresponding HTML file is generated too, containing information about
the picture and its metadata.
+You can set the following environment variables:
+* PAGESIZE (100 by default)
+* ORDERING ("Om" by default, zsh glob notation)
+* STYLE (URL to CSS file, by default is none, no stylesheet link is set)
+
If it is JPEG XL, then, for compatibility reason with non-bleeding edge
software, alternative format is generated too: either JPEG (if JPEG XL
contains losslessly transcoded JPEG), or PNG (leaving off the alpha channel).
-If image file has corresponding .txt, then it will be included as a
-preformatted text on HTML page.
+If image file has corresponding .txt/.html, then it will be included on
+HTML page.
-All images are sorted my modification date and grouped by pages,
-linking them together. If directory contains ".txt", then it will be
-included on the first page as a preformatted text.
+All images are sorted my modification date and grouped by pages, linking
+them together. If directory contains ".txt"/".html", then it will be
+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.