Bose Lifestyle V-Class Owner's Manual page 46

OPERATION
Table 2 Image view choices with a 16:9 input signal
Normal
(default)
Zoom
Stretch
Gray Bars
Signal is unchanged.
A 16:9 portion of the center of the signal
(inside the dashed line) is scaled up to enlarge
the overall picture. Some content along the
edges is lost.
A non-linear, horizontal stretch is applied to the
signal, making the image appear to be wider
than it actually is.
Vertical gray bars are added to the left and right
ends of the screen,
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