Adobe Photoshop CS4 - Manual (Page 580)

573 USING PHOTOSHOP CS4
Video and animation
Last updated 1/10/2010
4 Under Video, click the Settings button and set the following:
Compression Type Chooses the video compressor (codec) to compress your video.
Frame Per Second Specifies the number of individual images shown every second. NTSC is generally the standard
video format and is 29.97 fps. PAL is a European video format that is 25 fps. The standard for film is 24 fps. QuickTime
movies are sometimes created with a slower frame rate to reduce bandwidth and CPU requirements.
Movies with higher frame rates display motion better, but have larger file sizes. If you choose a frame rate that's lower
than the movie's current frame rate, frames are deleted. If you choose a number that's higher than the movie's current
frame rate, existing frames are duplicated (not recommended, since it increases file size without improving quality).
In most cases, your video will look better if you choose a number that your source fps is exactly divisible by. For
example, if your source is captured at 30 fps, choose a frame rate of 10 or 15. Don't choose a rate larger than that of
your source material.
Key Frame Every Specifies the key frame frequency. A higher key frame rate (lower number) improves video quality,
but increases the file size. With some compressors, an additional key frame is inserted automatically if too much of the
image has changed from one frame to the next. In general, one key frame every 5 seconds (multiply the frames per
second by 5) is usually sufficient. If you are creating a file for RTSP streaming and have concerns about the reliability
of the delivery network, you may want to increase key frame frequency to one key frame every 1 or 2 seconds.
Limit Data Rate To 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.
Depth Specifies the number of colors to include in video that you export. This menu is not available if the selected
codec supports only one color depth.
Quality If available, drag the slider or type a value to adjust the exported video’s picture quality and, consequently, its
file size. If you are using the same codec to capture and export, and you’ve rendered previews of a sequence, you can
save rendering time by matching the export quality setting with your original capture quality setting. Increasing quality
above the original capture quality does not increase quality, but may result in longer rendering times.
Scan Mode Specifies whether the exported movie has fields (Interlaced) or no fields (Progressive).
Aspect Ratio Specifies a 4:3 or 16:9 aspect ratio for the exported movie.
Options (Intel Indeo® Video 4.4 only) Sets compression, transparency options, and access for the Intel Indeo® Video
4.4 codec.
DV Stream export settings
The following options are available in the DV Export Settings dialog box:
DV Format Specifies either the DV or DVCPRO format for your exported video.
Video Format Specifies either NTSC or PAL video broadcast standard.
Scan Mode Specifies whether the exported video has interlaced fields or no fields (Progressive Scan).
Aspect Ratio Specifies an aspect ratio of 4:3 or 16:9.
Preserve Aspect Ratio Using Specifies an option if the movie is scaled to 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.
Important: Although the DV Export Settings dialog box has Audio Format options, Photoshop Extended CS4 does not
export audio in DV files.