How to create user defined paper sizes - Epson and Photoshop CS5 / CS6 / CC
For Red River Paper greeting cards, scrapbook 12x12 sheets, panorama printing, and other special projects, you need to define a custom paper size in the Epson printer properties. Below are instructions for setting a custom paper size in Photoshop.
In Photoshop click PRINT. Choose your printer from the Printer drop down menu.
Now click the Print Settings button. This will launch your printer's property dialog.
New Epson printer driver versions
On the Main tab of the printer's properties, locate and click the "User Defined..." button.
This brings up the User Defined Paper Size dialog.
Older Epson printer driver versions
From the media size drop menu choose USER DEFINED.
Set your paper width and height. Notice how Epson defines the dimensions - the numbers are .01 inches. So for a 7x10 card you would assign width as 700 and height as 1000.
When you are done click OK.
The custom size will now be available for your use in the paper size drop down menu.
Note for 13x38 panorama users - the max paper width will be set to 1295.