It is primarily required to display company logo instead of SAP standard wallpaper on SAP Easy Access Initial Screen. you can do it by using SMW0.
Go to transaction SMW0 and click on Binary Data for Web RFC Applications,
Click on Right Tick Mark on above.
On next screen you will see a execute button don’t select any package just execute it.
On the next screen create a new entry by selecting Create button. Enter Object Name and Description. Press Enter to select the Image using File Browser. Select the Image and press Import.
Then go to SM30. Select table SSM_CUST. There will be a perameter called START_IMAGE. Enter parameter value (TEST IMAGE in our case).
It will ask for a Transport Request. Create a Local Request.
Log off and login again. You will see new logo.