How can I make the display narrower in Yosemite with 4K display?

This is a Mac Pro 2013. It runs Yosemite 10.10.1. I have a Panasonic 4K TV connected to it, running at 3840 x 2025 @ 24 Hz. This Panasonic does not display the left and right inch or so of the screen image.
Looking at this, the Mac Pro 2013 version of a 4K image is 4096 x 2160 pixels, which is 256 pixels wider than this Panasonic screen and might just account for the problem I am seeing.
How can I reduce the output on the Mac so that it nicely fits onto the pixels of the Panasonic screen? After all this used to happen very easily with my 1920 x 1080 previous monitor.

Thanks Brendan, but I cannot find the underscan facility in Yosemite.
But I have managed to alter the HDMI setting on the TV and then restarted both the TV and the Mac and this magically sorts itself out. (It took me two hours of trials to find this.)
regads,
Tim

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