[doodlesdev]

I'm not aware of any photo editing software that can export 12bit JPEG (although to be fair I don't know many), I am aware though that JPEG 2000 supports 12bit color and that JPEG XT supports up to 16bit color, perhaps that's whats causing the confusion?

[robinsonb5]

The archetypal libjpeg has supported 12-bit for a long time, but it's a been a compile-time option, so an application (or distro package) had to choose which bit-depth to support.

[x4e]

Darktable supports it under JPEG2000: https://docs.darktable.org/usermanual/4.0/en/overview/suppor... (Darktable also supports JPEG XL)

[chungy]

JPEG2000 is a different format, just as JPEG XL isn't the same as original JPEG.

[JyrkiAlakuijala]

12 bit jpeg is a different format in practice. Better to move forward than adding support for a new ancient format.

Also, jpegli can support 10+ bits within the old compatible "8 bit" formalism.