Adobe 22030000 User Guide - Page 39

Aspect ratios, Pixel and screen aspect ratios

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ENCORE CS3 35 User Guide Note: When you open a project file you've moved, a dialog box may appear if the application can't locate specific assets. You can either relink them in the dialog box, select Offline to open the project without them, or select Skip Missing Files to temporarily set the assets offline (so that the next time you open the project, Encore prompts you again to locate the assets). When working with offline assets, use the Locate Asset command to relink them before you build or preview the project. Rename a project ❖ To rename the project, select the file and folder in Microsoft Windows Explorer or the Mac OS Finder and enter matching names (make sure to leave the .ncor extension in the project filename). Aspect ratios Pixel and screen aspect ratios Digital video uses two types of aspect ratios: pixel aspect ratios and screen aspect ratios (also referred to as frame aspect ratios). Although related, they describe distinct properties. The pixel aspect ratio describes the pixel dimensions within the screen, while screen aspect ratio details the screen dimension relationship. Pixel aspect ratios Pixel aspect ratios describe the width-to-height ratio of the pixels that make up a video or still-image file. Pixels are either square or nonsquare (rectangular). Square pixels have a ratio of 1:1. In the film and video industry, however, the :1 is usually dropped and ratios are expressed as a single number. The following table lists the nonsquare pixel aspect ratios for the two TV standards for standard-definition video. TV Standard NTSC PAL Fullscreen pixel aspect ratio 0.9 1.066 Widescreen pixel aspect ratio 1.22 1.422 A B C D A 720 x 480 pixel image can have a screen aspect ratio of either A. 4:3, or D. 16:9, depending on whether it has a pixel aspect ratio of B. 0.9, or C. 1.22. The type of pixels in an image, combined with its dimensions, determine its screen aspect ratio. An NTSC 720 x 480 pixel video, for example, displays as widescreen if it contains nonsquare pixels with a ratio of 1.22, and as a regular 4:3 screen if it contains nonsquare pixels with a ratio of 0.9. Encore lets you specify the pixel aspect ratio of imported assets.

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ENCORE CS3
User Guide
35
Note:
When you open a project file you’ve moved, a dialog box may appear if the application can’t locate specific assets.
You can either relink them in the dialog box, select Offline to open the project without them, or select Skip Missing Files
to temporarily set the assets offline (so that the next time you open the project, Encore prompts you again to locate the
assets). When working with offline assets, use the Locate Asset command to relink them before you build or preview the
project.
Rename a project
❖
To rename the project, select the file and folder in Microsoft Windows Explorer or the Mac OS Finder and enter
matching names (make sure to leave the .ncor extension in the project filename).
Aspect ratios
Pixel and screen aspect ratios
Digital video uses two types of aspect ratios: pixel aspect ratios and screen aspect ratios (also referred to as
frame
aspect ratios
). Although related, they describe distinct properties. The pixel aspect ratio describes the pixel dimen-
sions within the screen, while screen aspect ratio details the screen dimension relationship.
Pixel aspect ratios
Pixel aspect ratios describe the width-to-height ratio of the pixels that make up a video or still-image file. Pixels are
either square or nonsquare (rectangular). Square pixels have a ratio of 1:1. In the film and video industry, however,
the
:1
is usually dropped and ratios are expressed as a single number. The following table lists the nonsquare pixel
aspect ratios for the two TV standards for standard-definition video.
A 720 x 480 pixel image can have a screen aspect ratio of either
A.
4:3, or
D.
16:9, depending on whether it has a pixel aspect ratio of
B.
0.9, or
C.
1.22.
The type of pixels in an image, combined with its dimensions, determine its screen aspect ratio. An NTSC 720 x 480
pixel video, for example, displays as widescreen if it contains nonsquare pixels with a ratio of 1.22, and as a regular
4:3 screen if it contains nonsquare pixels with a ratio of 0.9. Encore lets you specify the pixel aspect ratio of imported
assets.
TV Standard
Fullscreen pixel
aspect ratio
Widescreen pixel
aspect ratio
NTSC
0.9
1.22
PAL
1.066
1.422
A
B
C
D