It is very easy to configure and use scanner on openSUSE 12.2, GNOME 3.4.2 thanks to YaST.
Connect the scanner
I own a HP scanjet 2300c flatbed Scanner. I connect the scanner to the power adapter. Then i use the USB connector cable to connect the scanner and the computer. I ensure that the light in scanner bed is glowing.
Configure the scanner in YaST
I proceed to open GNOME Activities using left "Win" key or by pressing "Alt+F1". Then type in the search query as "YaST" and YaST should appear grouped under "Applications". On opening YaST we will be prompted to enter administrative password which we must provide.
In YaST we need to locate scanner settings by searching for scanner applet.
In the scanner configuration window it is recommended that we click on the edit button and reconfigure the scanner even though you may see a default scan driver showing up in the menu.
In the setup wizard we can type in the scanner model and search for the relevant scanner driver and apply the settings using the "Next" button at the bottom of the window. The YaST wizard will save the settings and you can exit the Scanner Configurator by pressing the "OK" button.
In order to start scanning i go back to GNOME activities by pressing left "Win" key or by pressing "Alt+F1". Then i type in the search query "Simple Scan" and Scanner application will show up grouped under applications.
I am using my old stamp collection as test subject and I placed the stamp album page facing the light / glass on the scanner. Then I click on "Single Page" sub menu under "Scan" menu and viola the scanner could scan the pages. Thank you openSUSE :-)