m2cw – my 2 cents worth

from canon website

How do I use iPhoto to create borderless 4″ x 6″ prints?

To use iPhoto to create borderless prints, please follow all of the steps below:

While logged in as an Administrator, install Canon version 1.60 printer drivers onto your computer (with Mac OS X v10.2 or later as the operating system) and select the appropriate printer as the default.
Launch iPhoto.
From iPhoto, select and open the image you wish to print. (Please refer to the Apple web site for instructions on how to use iPhoto.)
When you are ready to make a print, select from the “Menu Bar” “File: Page Setup”.
The “Page Setup” dialog will appear.
Select the following settings:
Settings: Page Attributes
Format for: select the Canon printer you wish to use
Paper Size: 4×6 (borderless)
Orientation: select the matching orientation
Scale: select the appropriate scale
Select “OK” and the “Page Setup” dialog will close.
From iPhoto, from within the “Constrain” section of the browser window, select from the pull-down menu (i.e., the button directly above the “Constrain” label) either “4×6” or “4×6 Portrait”. Then, using your mouse cursor, mouse-over the image and when the “Cross-Hairs” are over the upper left-hand corner of the portion of the image you wish to print, click and drag from the left to the right in a downwardly diagonal motion, releasing the click at the end of the image selection.
Click the Crop button.
From the “Menu Bar”, select “File: Print”, select your options, then select “Print”.
This selection, revealed in the iPhoto window will now print as a borderless, 4×6 print.