Yes, it is the link given by paweld. Just checked the LazImageEditor under Linux: gtk2, gtk3, qt5, qt6 - all working, gtk3 requires Laz 4.99, though. There are two difficulties:
- You must have installed the LazColorPalette package (you can find it in OPM or at the same sourcefourge site in folder components/colorpalette)
- There is some code to find a configuration file, and the imageeditor gets lost in the Linux folder structure and tries to find the "default.pal" color palette somewhere in the share folder, but there is no installation which puts it there... Since this file exists already among the other source files in the lazimageeditor folder it is easier to modify the mainform's OnCreate a little bit so that this place is found instead:
procedure TMainForm.Formcreate(Sender: TObject);
var
palFN: String;
begin
...
UpdatePictureToolsEnabled;
UpdateToolSettings;
palFN := vConfigurations.MyDirectory + 'default.pal';
if not FileExists(palFN) then
palFN := Appliation.Location + 'default.pal';
Palette.LoadPalette(palFN);
// Main Form
....