ViewSonic LDP216-121, User Manual

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Menu Option Description
Aspect Ratio
The
Aspect Ratio
is the ratio of the image width to the image
height.
Auto
Scales an image proportionally to fit the projector’s native
resolution in its horizontal width. This is suitable for the
incoming image which is neither 4:3 nor 16:9 and you want to
make the most use of the screen without altering the image’s
aspect ratio.
4:3
Scales an image so that it is displayed in the center of the screen
with a 4:3 aspect ratio. This is most suitable for 4:3 images like
computer monitors, standard definition TV, and 4:3 aspect DVD
movies, as it displays them without aspect alteration.