Version: (using KDE 4.1.0) Compiler: Ubuntu 8.10 OS: Linux Installed from: Ubuntu Packages When using Digikam to browse the collection and then entering "View Mode", the photo can be zoomed by using the zoom widget in the bottom right - but unfortunately there doesn't seem to be any intuitive keyboard shortcut for zooming in and out. I suggest a keyboard shortcut, the same as in Showfoto and in many other Linux apps: zoom-in with the "+" key in the keypad, and zoom out with "-".
Use CTRL+/-