This plugin adds a status bar showing the image coordinates of the pixel your cursor hovers around, as well as the RGB values of that pixel.
This plugin is made for versions of eog running on GTK version 3. Practically speaking, it has only been tested on Eye of Gnome version 42.
showcase.mp4
Copy mouse-coords-and-rgb.py and mouse-coords-and-rgb.plugin into ~/.local/share/eog/plugins if you're on Linux, then make sure to enable the plugin by opening the hamburger menu and going into “Setting” and choosing the “Plugins” tab where “Mouse Coordinates and RGB” should hopefully be listed.
Originally, this plugin was written by sdaau for the Gnome2 version of eog and his code is available in his “SdaauBckp” repository on SourceForge (WebArchive link). I (precondition) updated the code to be compatible with Gnome3. In addition to merely bringing the code up-to-date, I removed info related to the scaled image size, the zoom level, and the eog window coords because I found them to be unnecessary noise. In their place, I added RGB info to get something closer to the status bar of the OpenCV image/video viewer. I also removed the feature that lets you copy the mouse coords into clipboard since that was implemented with the obsolete “UI Manager” framework and I couldn't be bothered to figure out how to re-implement this feature I don't need in the new framework.
The code could definitely make use of a clean-up and refactor but it works for me ¯\_ (ツ)_/¯