https://zh.docs.baslerweb.com/visualapplets/files/manuals/content/ch10s05s01s01.html
Grayscale JPEG Encoding
jpeg encodinggrayscale
https://nuttx.apache.org/docs/12.7.0/applications/graphics/libjpeg/index.html
libjpeg libjpeg JPEG image encoding — NuttX latest documentation
jpeg imagelatest documentationlibjpegencodingnuttx