NEC NP-PA550W User Manual page 109

LETTER BOX The image of a letterbox signal (16:9) is stretched equally in the horizontal and vertical directions
to fit the screen.
WIDE SCREEN The image of a squeeze signal(16:9) is stretched left and right in 16:9.
ZOOM The image of a squeeze signal (16:9) is stretched left and right in 4:3.
Parts of the displayed image are cropped at the left and right edges and therefore not visible.
4:3 FILL The image of a signal(4:3) is stretched left and right in 16:9.
TIP:
• Image position can be adjusted vertically using [POSITION] when the [16:9], [15:9], or [16:10] aspect ratios are selected.
• The term "letterbox" refers to a more landscape-oriented image when compared to a 4:3 image, which is the standard aspect
ratio for a vide source.
The letterbox signal has aspect ratios with the vista size "1.85:1" or cinema scope size "2.35:1" for movie film.
• The term "squeeze" refers to the compressed image of which aspect ratio is converted from 16:9 to 4:3.
[RESOLUTION]
This function sets the resolution of a projected image if auto-detect fails to work well.
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5. Using On-Screen Menu