XnView Software

I noticed that.
Maybe the priority isn't high, or the developers assume that JPEG files with XYB are considered experimental and only a few people are using that coding option.
Anyway, in the meantime, until a proper bugfix is in the official code of jpegli,
a quick fix might be disabling color ...

CMYK color space is primarily of interest for printing images. For displaying CMYK images on a monitor they have to be converted to RGB color space for that purpose.

Are you sure that JXL (lossy) is always 444?
Raw 420 data consumes 60% of 444 data space. Seems akward if JXL didn't have opportunity to use this.

JPEG XL does use XYB color space by default. 420 subsampling is only defined for YUV color space.
Only legacy JPEG does use YUV color space by ...

Ok, but there is a notice in the libjxl that further development of jpegli will happen in the jpegli repository.

https://github.com/libjxl/libjxl/blob/main/lib/jpegli/README.md

Maybe there will backport jpegli development to the libjxl repository.

Incorrect XYB subsampling in cjpegli hasn't ...

Important fix of JPEG with XYB color profile and subsampling is in git now. XYB color subsampling was incorrect in the past.

https://github.com/google/jpegli/pull/130

Yeah,
but the developers of jpegli claim their own jpeg decoder use floating point calculation and conversion to integer only once, so there are fewer rounding errors, which means possibly more accuracy.

https://github.com/google/jpegli#decoder-improvements

I compared decoding existing jpeg ...

Another option that might be worth investigating is jpegli decoding for JPG files, in other words the decoder of jpegli.

The developers of jpegli claim higher quality decoding of jpeg files.

Update to Libjxl 0.11.1

Two security related bugfixes.

https://github.com/libjxl/libjxl/releases/tag/v0.11.1

Yeah, that's helpful for people who use programs that have color profile processing included, like XnView,
but when you create images for other people, people view them with programs you don't know,
it's better not to use XYB color profile, because there are a lot of image viewing apps and programs ...

I get a strange colour effect for the preview when choosing JPEG-LI (I tried different settings but that didn't make any difference), which doesn't happen when that is not ticked, however the actual export is okay.

I'm unable to reproduce with the attached file, but it seems that you use a ...

Update of libjxl 0.11.0 is released, now.

Color subsampling is for YUV colorspace in JPEG only, XYB colorspace should be used without any subsampling.

The developer of JPEG XL have already announced the release of version 0.11.0, which is planned in a few days from now.
The 0.10.3 release is just as a quick fix of a serious bug.

https://github.com/libjxl/libjxl/issues/3700

Google released a new JPEG coding library, named JPEGli.

https://opensource.googleblog.com/2024/ ... brary.html

Is it planed to add it to XnView Classic? Thanks.

Thank you, Pierre, for providing updates for webp.
Please update the WebP plugin for XnView Classic available as separate download as well.