Canon SX6 User Manual page 56

True size
If the display resolution of the computer is higher than 1400 by 1050 dots (1024 by 768 dots
for X700), select a lower resolution before starting projection.
The upper, lower, left, and/or right portions of a projected image may be missing depending
on the Aspect setting.
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Select this if you want to project a computer screen in its orig-
inal size.
A clear image can be obtained because of no image pro-
cessing.