On our older TV, we have it set so the HD channels come through normally and the SD channels are stretched out to fit the screen. Everyone looks a little fatter than normal but after a week or so of watching it that way, we hardly ever notice. We used to use the black bars on the side on SD channels but started to notice a bit of burn in. It's an older plasma unit and it doesn't have an option to use gray bars.
On our newer TV, we have it set so the HD channels come through normally and the SD channels are only stretched on the sides. It's a bit weird but basically stuff in the middle is relatively unstretched but the sides make up for it. Hard to tell at all that the TV is monkeying with the picture until a character is stuck at the side of the screen.
On both, it's a setting on the TV rather than on the Shaw box that does this.
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