qt-jpegxl-image-plugin VS ksnip

Download qjpegxl.dll and qavif.dll and copy the DLL files into imageformats folder.

Found the solution! Download the jxl image plugin dll from here and put it in D:\Dropoff\XnViewMP-win-x64\XnViewMP\plugins\imageformats. Now XnView will properly decode JXL files with .jxl file extension and show thumbnails in the app. It decoded a 50 MP lossy JXL (4:4:4 I believe) in 2 seconds with my 9100F CPU.

KDE's KImageFormats plugin for Qt supports JXL, though this may not be enabled on your distro. If it is, Qt image viewers like Gwenview can be used to view JXL files. If not, there's another plugin available, which may be available in your distro or you can build it yourself, which also enables programs like Gwenview to use JXL.

Original PhotoQt v2.3 can be easily enhanced to display JXL images on Windows just by adding qjpegxl.dll plug-in.

digiKam is able to display JXL files when qt-jpegxl-image-plugin is installed.

For jxl look at https://github.com/novomesk/qt-jpegxl-image-plugin/

can also be used in non-KDE X11 desktop environments.

which doesn't really explicitly say much, and in fact the only tool I could find that claimed to be able to support everything was ksnip, which seems to work fine with wlroots but beyond that https://github.com/ksnip/ksnip#known-issues outlines the situation well enough; KDE is at least only temporarily broken, but GNOME isn't going to improve because GNOME did that on purpose. Now, that readme says you can use xdg-desktop-portal, but I have a GNOME+Wayland machine on hand, and I couldn't get it to actually work. I think what's supposed to happen is that every time I do a screenshot it prompts for permission, which I wanted to verify so I could complain that that was totally unreasonable, but what actually happens is that it just fails, which is... not better. Oh, and while searching for solutions to that I found flameshot, but that just refuses to even run. So... maybe someday the portal solution will work; in the meantime, I feel comfortable describing the situation as Wayland not having a uniform working way of taking screenshots.

[0] In particular, so we can avoid the situation from X11 where a load of drawing primitives are baked in that nobody has any use for anymore.

Ksnip is a simple and efficient cross-platform screenshot tool with all the essential annotation features. Whatsek raves, "Try ksnip! Went from greenshot to share, way too many features, found ksnip. Tabs... Awesome!"

Otherwise, the simplest solution is probably to either stick to the older Spectacle versions or use another screenshot tool like Flameshot or ksnip.

ksnip - screenshot tool with annotation features. https://github.com/ksnip/ksnip

ksnip is a cross-platform screenshot and annotation tool

Ksnip https://github.com/ksnip/ksnip

Hey, I've been using [ksnip](https://github.com/ksnip/ksnip) which works really well on both my Rocky Linux 8.7 laptop and my Ubuntu 22.04 LTS workstation. It's Qt based, so it depends on your love or hate for that, but it works VERY well.