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How to Set Up Custom Paper Size in Photoshop on a Mac

Custom paper sizes are defined in the print dialog. Learn how to do this when working in Photoshop.


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 printer properties.

Canon Printer Alert - Canon printers can use sheets up to 26.6" long and on some printers 47.5". Refer to your manual or the Canon website for details. This rule is hard wired into the driver by Canon and cannot be overcome.

TO BEGIN

Go to FILE > PRINT in Photoshop.

Choose your printer from the Printer drop down menu

Then click PRINT SETTINGS

Custom Size

PRINT DIALOG

Click the Paper Size drop down menu.

Print Dialog

Under "Paper Size" choose "Manage Custom Sizes".

Manage Custom Sizes

Custom Page Sizes

Custom Page Sizes

1. Click the + button to start a new size. Set the width and height.

2. Click on the new size and name it something appropriate.

3. Set the width and height of the custom size.

Width = the smaller dimension of your paper
Height = the longer dimension of your paper

4. Set Printer Margins.  Use 0.2" on all four sides. Setting the number lower will likely result in errors or partially printed images.

The Apple OS may not handle custom paper sizes correctly. It is system and printer specific and may not happen to you. If it does, prints will have uneven margins or print only a portion of the image. Come back to this dialog box and adjust the Printer Margins. This may take some experimentation but is necessary.

Click OK to complete the process.

HANDLING 13x38 and 6x38

Newer OS versions can have issues handling custom sizes. If your printer prints only a portion of the image, the image but in a smaller form, or will not print at all, you likely are seeing a custom paper size error.

For 13x38 or 6x38

Set paper width to 12.95"
Set paper height to 38"

Canon Printer Alert - Canon printers can use sheets up to 26.6" long and on some printers 47.5". Refer to your manual or the Canon website for details. This rule is hard wired into the driver by Canon and cannot be overcome.

Margins

Margins must be set to 0.2" or larger. Smaller numbers may result in OSX designating your size as a roll and the printer will not print.