Full bleed printing with the Pixma iX6820

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Is there some setting I can change to get full bleed printing on a custom-sized sheet of 9x12 inch paper?

I print on Arches Oil Paper, and -- right now -- the best I can do is to get (approximately) a 1/4th inch border of white space around the picture.

If you have any ideas on this, please let me know.

Thanks.