Quick tip: GIMP as Irfanview's external editor

If you’re using GIMP and Irfanview (in Windows), set up GIMP as your external editor in Irfanview’s Options, under ‘Misc 2’ tab by filling the “Set external viewer/editor” field with “C:\Program Files\GIMP-2.0\bin\gimp-win-remote.exe gimp-2.2.exe” (not including the quotation marks, i.e. only fill in what is inside them). Change the version numbers if you’re using something other than GIMP 2.0 and Gimp-Win-Remote 2.2.

Now you can go directly from viewing an image in Irfanview to editing it in GIMP by selecting ‘Open with external editor’ from the File menu.