From the Preset menu in the New dialog box, choose the
Film & Video preset.
Choose the size that’s appropriate for the video system
on which the image will be shown.
Click Advanced to specify a color profile and specific
pixel aspect ratio.
Important:
By default, nonsquare pixel documents
open with Pixel Aspect Ratio Correction enabled. This setting scales
the image so it appears as it would on the nonsquare-pixel output
device (usually a video monitor).
Optional To view the image as it would
appear on a computer monitor (square pixel), choose View >
Pixel Aspect Ratio Correction.
Circle in NTSC DV (720 x 480 pixels) document viewed on computer
(square pixel) monitor with Pixel Aspect Ratio Correction turned
on (top) and Pixel Aspect Ratio Correction turned off (bottom)
You can simultaneously view an image with the Pixel
Aspect Ratio Correction turned on and off. With the nonsquare pixel
image open and Pixel Aspect Ratio Correction enabled, choose Window >
Arrange > New Window For [name of document]. With the
new window active, choose View > Pixel Aspect Ratio
Correction to turn off the correction.
If you have a display device, such as a video monitor,
connected to your computer via FireWire, you can preview the document
on the device:
To set output options before previewing
the image, choose File > Export > Video
Preview.
To view the image without setting output options,
choose File > Export > Send Video Preview
To Device.
When creating images for video, you can
load a set of video actions (included with Photoshop) that automate
certain tasks—such as scaling images to fit video pixel dimensions
and setting the pixel aspect ratio.