Adobe Premiere Pro CS3 Manual de usuario descargar pdf (Pagina 37)

ADOBE PREMIERE PRO CS3

User Guide

About square-pixel footage

Many graphics and animation programs generate square-pixel assets meant for display on square-pixel computer

monitors. Adobe Premiere Pro, however, typically generates files with non-square pixels for display on television

sets. Adobe Premiere Pro automatically conforms square-pixel assets to the project’s pixel aspect ratio. After the

asset is conformed, however, it no longer has its original frame aspect ratio. Also, its frame aspect ratio is not likely

to match that of the project, even if it did before it was conformed.

For example, suppose you generate a square-pixel asset at 720x540 and import it into an Adobe Premiere Pro DV

project with an aspect ratio of 720x540. In this case, the asset will be wider than the screen when it is conformed.

You can use the Scale control to set the size of the asset’s frame within the project’s frame. However, to preserve the

asset’s frame aspect ratio, Adobe Premiere Pro often needs either to crop the asset or to frame it within black bars.

You can prevent this kind of cropping and framing by generating assets from your square-pixel graphics or

animation programs in a frame aspect ratio that, when conformed, matches the project’s frame size exactly. For best

results, use programs such as Adobe Photoshop® and Adobe After Effects® that include pixel aspect ratio settings,

and set the frame dimensions and pixel aspect ratio to match those of your project. If the pixel aspect ratio setting

is unavailable in your program, do not try to match the frame dimensions (for example, 720x540). Instead, ensure

that the overall frame aspect ratio matches that of your project (for example, 4:3 or 16:9). Adobe Premiere Pro

automatically adjusts the video so that it is not distorted.

If your square-pixel program requires frame dimensions, use the option that matches your project’s output:

• 4:3 DV (NTSC) or ATSC SD—create and save the square-pixel file at 720x534.

• 4:3 D1 (NTSC)—create and save the square-pixel file at 720x540.

• 4:3 DV or D1 (PAL)—create and save the file at 768x576.

• 16:9 DV (NTSC)—create and save the file at 864x480.

• 16:9 D1 (NTSC)—create and save the file at 864x486.

• 16:9 DV or D1 (PAL)—create and save the file at 1024x576.

• 16:9 1080i HD—create and save the file at 1920x1080.

• 16:9 720p HD—create and save the file at 1280x720.

Using assets with various aspect ratios

Adobe Premiere Pro automatically attempts to preserve the frame aspect ratio of imported assets, sometimes

changing the pixel aspect ratio, the frame dimensions, or both so that the asset does not appear cropped or distorted

when used in a sequence. Assets created in an Adobe Creative Suite application contain metadata that allows Adobe

Premiere Pro to make the calculations automatically and precisely. For assets lacking this metadata, Adobe Premiere

Pro applies a set of rules to interpret pixel aspect ratio.

Anamorphic 2:1 2.0 Footage was shot using an anamorphic film lens, or it was anamorphic-

ally transferred from a film frame with a 2:1 aspect ratio.

HDV 1080/DVCPRO

HD 720 (After Effects),

HD Anamorphic 1080

(Adobe Premiere Pro)

1.33 Footage has a 1440 x 1080 or 960 x 720 frame size, and the desired

result is a 16:9 frame aspect ratio.

DVCPRO HD 1080

(After Effects only)

1.5 Footage has a 1280 x 1080 frame size, and the desired result is a 16:9

frame aspect ratio.

Pixel aspect ratio When to use

April 1, 2008

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