User guide

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3.5 Scaling and Cropping
Sometimes the picture does not fit the display.The aspect ratio of the Bengal is 1.77 (16x9), the same as
HDTV.
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The aspect ratio of a picture is its width divided by its
height. 1280 ÷ 720 = 1.77
The effective resolution of the Bengal display (i.e. the
number of pixels visible on the screen) is about
1232x693 pixels, but may vary slightly from unit to
unit.
The aspect ratio of a Bengal is 1.77 (16x9). When the
source picture’s aspect ratio is not the same as the
Bengal, you have to do something to make the picture
fit. You have three basic choices:
• Fill the area both ways. This will produce some
distortion in the picture. Circles will not be
round.
• Put the picture in without distortion crop the top
and bottom.
• Put the picture in without distortion and fill the
extra space with black.
Scale Mode determines how the picture will be made
to fit the display.
• Fill All means that the picture will touch the bor-
ders of the display all around, even if this means
stretching (and distorting) the picture in one
direction.
• Letterbox/Pillarbox means expand the picture
until the first edges (top-bottom or left-right)
touch the border of the display, then fill in the
other sides with a solid color.
• Crop means expand the picture until the second
edges touch the border and let the other edges of
the picture fall outside the display and get
cropped.
• Wide screen means force the aspect ratio to 1.77,
the standard for many DVD movies.
• Normal Video means force the aspect ratio to
1.33, the standard for television.
• One to One means show the picture without any
scaling. If it is larger than the display’s native res-
olution it will be cropped, if it is smaller it will be
shown with a black border. This is most useful for
1280x720 resolution, in order to show the image
with no scaling artifacts and only a slight loss of
pixels around the edges.
A picture with an aspect ratio of 1.33 is shown.
Scale Mode = Normal Video (4x3)
Justify = Center
Overscan=0%
Same picture,
Scale Mode = Fill All
Justify=Grayed out
Overscan=0%