In Epson Scan 2, you can register user-defined sizes for the originals you want to scan.
When you are using Document Capture Pro, you can open the window by pressing the Detailed Settings button on the Scan Settings screen.
In Epson Scan 2, select the Main Settings, and then select Document Size > Customize.
Click the + button on the Document Size screen.
Enter a name to save the user-defined size.
Enter the Width and Length of the size you want to register.
When you select Detect paper length, the scanner automatically detects the length of the original. When using this feature, you cannot enter a Length.
Using Detect paper length may slow down the scanning speed.
Click OK.
The registered user-defined size is added to the Document Size list.