Photo, Designer - Support JPEG XL lossless compression.

[Zai]

While exporting JPEG XL files is possible, so far only lossy compression is supported. JXL is a feature-rich format, but being unable to store data losslessly limits its use as a modern alternative to TIFF or PNG. Therefor an addition of this feature would be beneficial.

[dotAF]

I agree. It seems like an odd omission to not be able to export lossless JXLs. Please add an export options preset for this.

[C18]

I was looking to convert scanned 16bit .tiffs to lossless JPEGXL (about 59% the original size with Krita, and 76% the size of a PNG version). Apparently, unless one uses the terminal, there are no options available for a GUI batch exporter (XnConverter only does 8-bit). Leveraging the Affinity batch exporter for this would be great.

 

Edit: I forgot Dartable and DigiKam would also work...

[Steps]

I'm looking to move on from TIFF files, too.

+1 for lossless JPEG XL

[ATP]

+1

Complete support from me too. There's a lossless option with WebP, so we should definitely get the option with JPEG XL too.

The latest libjxl version has a 10x improvement in memory usage and greatly increased speed.

I could suspect the high memory usage was a reason to not support the lossless option, but that worry is now in the past. The same is true for the lossy mode, though not important for this topic.

This newly released article has an overview of the improvements and some comparisons to other formats. I highly recommend checking it out.