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I'd really love Emacs to have native JPEG XL support. For I use Emacs as a pictures viewer and the only thing preventing me from converting all my family pictu

I'd really love Emacs to have native JPEG XL support. For I use Emacs as a pictures viewer and the only thing preventing me from converting all my family pictures from JPEG to JPEG XL (it's a 22% saving which results in JPEG XL files that can be converted back, bit-for-bit, to the original JPEG file) is the lack of Emacs support for JPEG XL. Does anyone know if it's coming? Anything in the JPEG XL or JPEG XL libs license that makes it a problem to incorporate in Emacs?

zellyn 3y ago
Why not add support? Nobody owns emacs any more or less than you!
- TacticalCoder 3y ago
  Well ofc and I know some elisp but I take it integrating libjxl (now using the "new BSD license") or another library supporting jxl is one of those things requiring C guru skills. And it's been a really long time I haven't written a line of C code. Moreover I take it that, say, for someone who added WEBP support to Emacs, adding JPEG XL would be kinda a no-brainer. But I fully get your point...
donio 3y ago
Emacs can handle JPEG XL files as long as you build it with ImageMagick enabled and ImageMagick is built with JPEG XL support. You can try evaluating (imagemagick-types) to see if it's enabled. If it fails with "void-function" that means that your Emacs was not built with ImageMagick enabled. If it returns a list of file types but the list doesn't contain "JXL" then your libMagick might be too old or not compiled with JPEG XL support.
- TacticalCoder 3y ago
  Ah that's interesting, I wasn't aware. I'll try that and recompile if needed, thanks a huge lot for the info!
- TacticalCoder 3y ago
  > ... then your libMagick might be too old I did check: I'm running the latest Debian stable, Bookworm, which basically just came out and it ships ImageMagick 6.9.11 but apparently JPEG XL support was only added in 7.0.10. Oh the joy of running Debian! (I'll see if I bump ImageMagick to a more recent version or not).

zellyn 3y ago

Why not add support? Nobody owns emacs any more or less than you!

TacticalCoder 3y ago
Well ofc and I know some elisp but I take it integrating libjxl (now using the "new BSD license") or another library supporting jxl is one of those things requiring C guru skills. And it's been a really long time I haven't written a line of C code. Moreover I take it that, say, for someone who added WEBP support to Emacs, adding JPEG XL would be kinda a no-brainer. But I fully get your point...

donio 3y ago

Emacs can handle JPEG XL files as long as you build it with ImageMagick enabled and ImageMagick is built with JPEG XL support. You can try evaluating (imagemagick-types) to see if it's enabled. If it fails with "void-function" that means that your Emacs was not built with ImageMagick enabled. If it returns a list of file types but the list doesn't contain "JXL" then your libMagick might be too old or not compiled with JPEG XL support.

TacticalCoder 3y ago
Ah that's interesting, I wasn't aware. I'll try that and recompile if needed, thanks a huge lot for the info!
TacticalCoder 3y ago
> ... then your libMagick might be too old I did check: I'm running the latest Debian stable, Bookworm, which basically just came out and it ships ImageMagick 6.9.11 but apparently JPEG XL support was only added in 7.0.10. Oh the joy of running Debian! (I'll see if I bump ImageMagick to a more recent version or not).