Printing equal page background borders using Classic, Pro Pixma 10 and Imac

[shapiro tim]

When I print images with a page background color chosen, the left margin is not symmetrical with the right.  The left is a little larger.  I wonder if I have something wrong with my aspect numbers 

LCR. 9.4

Mojave 10.14.6

Printer Proxy Pro Pixma 10. 14.4

Printer set up for paper is 8.5 x 11 borderless

The photo is cropped to a 8 x 10

Thanks for your consideration.

 

[JP Hess]

I use the Pixma Pro 100. I discovered that for several different sizes it was necessary for me to create custom templates adjusting for uneven borders in order to have symmetrical borders on the actual prints. The 4 x 6" prints always seem to print just fine, but larger prints always seem to need a template to adjust for what I suppose you could call discrepancies. It was the easiest way to solve the issue for me.