this post was submitted on 06 May 2024
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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GTK is a UI toolkit, i.e. a piece of software that draws uniform-looking buttons and scrollbars and the like.
GTK used to stand for "GIMP toolkit" but GTK and GIMP development are now entirely separate, so much so, in fact, that 13 years after the release of GTK 3 and 3 years after the release of GTK 4, GIMP still hasn't upgraded to either.
GIMP's GTK3 port was finished several months ago. What remains to be done for GIMP 3.0 is bug-fixing and porting to the new Plug-in API.
The best way to upgrade to GTK4 is to upgrade to GTK3 first. There was some talk about working on GTK4 soon after GIMP 3.0 is out, but whether that will happen or not is uncertain.
Wait what’s the point of backporting to GTK2 then? And why should I as an end user care? Will it make the UI nicer?
GIMP has been releasing two versions for several years. First, the Stable release, which is the 2.10.x series. Second, the development release, which is the 2.99.x series, which is where the GTK3 work has been done. The work from the development release will culminate in the Stable release reaching 3.0. GIMP will continue to support 2.10.x for some time after 3.0 becomes stable, but eventually they will stop supporting it.
Most of the work right now is focused on the development release and getting GIMP 3.0 stable and ready for release, but they're still doing a little more work to tide users over until 3.0 is out. If you're curious how work on 3.0 is going: https://gitlab.gnome.org/GNOME/gimp/-/milestones/27#tab-issues
GTK3 brings Wayland support among other features and yes, it looks nicer. GTK3 is still maintained while GTK2 has been obsoleted, which means bug fixes are still landing. Once they're at GTK3, that makes it much easier to move to GTK4, which brings even better Wayland support (i.e. color management will actually be possible) and a much better UI in my opinion.