Reference
42
En
gli
sh
black (unlit) vertical bars visible on the vertical edges of the screen on either side of the image,
marking the difference between the width of a 4:3 aspect image and a 16:9 screen of the same
height.
Letterbox
Resizes and
scales
the image
proportionately
and
linearly
at a given zoom ratio which can reach
full screen, no matter what the aspect of the image source. This does not alter the displayed
image aspect.
'Letterbox' scales the image to a larger size than the screen on the expectation that the source is
presented in a 4:3 aspect ratio. This effectively enlarges the size of the image so that the width
matches the width of the screen, and the height stretches beyond the height of the screen to give
a 16:9 ratio version of the original 4:3 image, resulting with the cropping of the top and bottom
of the original 4:3 image. Some of the image is cropped and lost (not visible on-screen).
'Letterbox' is most suitable for images which are displayed in the so-called letterbox presentation
format, which is created from a 16:9 aspect ratio image
scaled
down proportionally to fit into a
4:3 aspect display frame, resulting in black (unlit) horizontal bars visible on the image top and
bottom marking the difference between the height of a 16:9 aspect image and a 4:3 screen of the
same width.
Wide
Resizes the image
non-linearly
, no matter what the aspect of the image source. This may alter the
resultant displayed image aspect.
'Wide'
non-linearly
resizes the height of the image until it matches the full display height, and
non-linearly
resizes the width of the image until it matches the full display width.
Non-linear
resizing typically alters the image more towards the edges of the image, leaving the centre
relatively unaltered.
Non-linear
resizing is useful for 4:3 aspect ratio images. This differs from
Original (source) video image
Resultant (displayed) video image
4:3 aspect ratio video image
Letterboxed video image
or
16:9 aspect ratio video image
Original (source) video image
Resultant (displayed) video image
4:3 aspect ratio video image
Letterboxed video image
16:9 aspect ratio video image
DV3251-En.book Page 42 Monday, December 12, 2005 4:07 PM
