Canon PIXMA MG2525 All-in-One Inkjet Printer (Black) - Manual (Page 257)

Setting Paper Dimensions (Custom Size)
You can specify the height and width of paper when its size cannot be selected from the
Paper Size menu. Such a paper size is called "custom size."
The procedure for specifying a custom size is as follows:
1. Creating a new custom paper size
In the Print Dialog , select Manage Custom Sizes... from Paper Size .
In the Custom Paper Sizes dialog, click + .
Untitled will be added to the list.
2. Setting details about the custom paper size
Double-click Untitled , enter the name of the paper size you want to register, and
specify the Width and Height of the paper for Paper Size .
Select User Defined or your model for Non-Printable Area , and enter the margins.
3. Registering the custom paper size
Click OK .
The custom size is registered.
Important
If the application software that created the document has a function for specifying
height and width values, use the application software to set the values. If the application
software does not have such a function or if the document does not print correctly,
perform the above procedure from the printer driver to set the values.
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