The current behaviour violate the Gnome HIG (http://library.gnome.org/devel/hig-book/2.32/input-mouse.html.en, serach for 'zoom'). The relevant text is quoted here for convenience:
"Ctrl+scrollwheel-up should zoom into the window or control under the mouse pointer, and Ctrl+scrollwheel-down should zoom out." ** Changed in: hundredpapercuts Status: New => Confirmed ** Changed in: hundredpapercuts Importance: Undecided => Low ** Changed in: hundredpapercuts Status: Confirmed => Triaged ** Changed in: eog (Ubuntu) Status: New => Confirmed ** Bug watch added: GNOME Bug Tracker #640657 https://bugzilla.gnome.org/show_bug.cgi?id=640657 ** Also affects: eog via https://bugzilla.gnome.org/show_bug.cgi?id=640657 Importance: Unknown Status: Unknown -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/686128 Title: Zoom / scroll behaviour is inconsistent with other Gnome programs -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs