24-bit grayscale JPEGs not converted
Dinesh said, on 23/02/2023
https://i.postimg.cc/SyBK1xvB/pingo.jpg
pingo -sb pingo.jpg
Currently, running maximum lossless compression on the above image does not automatically convert the image to 8-bit mode, which compresses slightly better after running through jpegtran: https://i.postimg.cc/6WCpkNsy/pingo-gray.jpg pingo should losslessly convert 24-bit grayscale JPEGs to 8-bit mode for better compression / performance, or provide a flag to toggle this behavior in case someone wants 24-bit grayscale JPEGs (e.g., EPUB compliance).
cédric (dev) said, on 19/07/2023
seems good in v1.x. ty for report