Adobe Photoshop CS4 Bedienungsanleitung PDF herunterladen (Seite 581)

574

USING PHOTOSHOP CS4

Video and animation

Last updated 1/10/2010

Image sequence settings for QuickTime export

Typically, QuickTime is used to export video files. However, you can also select Image Sequence from the QuickTime

Export pop-up menu. Click Settings to access the following options:

Format Chooses a file format for the exported images.

Frames Per Second Sets the frame rate for the image sequence.

Insert Space Before Number Inserts a space between the name and generated number in the image’s filename.

Options If available, click the Options button and set format-specific options.

For more information on the specific file formats and their options, see also “Saving and exporting files in other

formats” on page 458 and “File formats” on page 463.

For a video on working with image sequences, see www.adobe.com/go/vid0026.

Specify MPEG-4 export settings (Photoshop Extended)

1 In the Render Video dialog box, select QuickTime Export, and choose MPEG-4 from the pop-up menu. Then click

Settings.

2 In the MPEG-4 Export Settings dialog box, choose MP4 or MP4 (ISMA) from the File Format menu. The MP4

(ISMA) format ensures operability with devices made by ISMA members.

3 Under Video, specify the following:

Video Format Chooses the codec to compress your video. For the highest quality at the lowest data rate (or the smallest

file), H.264 is recommended. If you need the file to play on a device that supports MPEG-4 video, choose MPEG-4

Basic or MPEG-4 Improved, depending on the target device. If your source movie’s video track is already compressed,

you can choose Pass Through so that the video doesn't get compressed again.

Data Rate Specifies the kilobits per second (kbps) during playback. A higher kbps rate usually improves movie

playback quality; however, don't choose a data rate higher than the available bandwidth.

Optimized For Specifies how much the data rate can vary above and below the data rate you choose. This option

becomes available if you choose MP4 from the File Format menu, choose H.264 from the Video Format menu, click

Video Options, and select Best Quality.

Image Size Specifies the pixel dimensions of your exported video. Current maintains the source material size. To

specify a size not listed in the Image Size menu, choose Custom.

Preserve Aspect Ratio Using Specifies an option if the movie needs to be scaled to the new pixel dimensions. Letterbox

scales the source proportionally to fit into the clean aperture, adding black bars to the top and bottom or sides as

necessary. Crop centers, scales, and trims to the clean aperture. Fit Within Size adjusts to the destination size by fitting

to the longest side, scaling if necessary.

Frame Rate Specifies the frame rate for the playback of your exported video. Usually, your video looks better if you

choose a number that is exactly divisible by the frames per second (fps) of your source. For example, if your source is

captured at 30 fps, choose a frame rate of 10 or 15. Don’t choose a rate greater than that of your source material.

Key Frame Specifies that key frames are generated automatically or specifies how frequently key frames are created in

the exported video. A higher key frame rate (lower number) improves video quality, but increases the file size.

4 (MP4 file format only) Click the Video Options button and specify the following:

Re-sync Markers (MPEG-4 Basic and MPEG-4 Improved only) Uses re-sync markers in the video bit-stream. This can

help regain synchronization due to transmission errors.

Restrict Profile(s) To (H.264 only) Selects profiles for playing video files on a device that conforms to one or more of

the standard's profiles.

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