Adobe Photoshop CC 2014 v.14.xx - Manual (Page 750)

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You can create a custom pixel aspect ratio in existing documents, or delete or reset pixel aspect ratios previously assigned to a document.
Assign a pixel aspect ratio value to an existing document
With a document open, choose View > Pixel Aspect Ratio and then choose a pixel aspect ratio that’s compatible with the video format that
you’ll be using your Photoshop file with.
Create a custom pixel aspect ratio
1. With a document open, choose View > Pixel Aspect Ratio > Custom Pixel Aspect Ratio.
2. In the Save Pixel Aspect Ratio dialog box, enter a value in the Factor text box, name the custom pixel aspect ratio, and click OK.
The new custom pixel aspect ratio appears in both the Pixel Aspect Ratio menu of the New dialog box and in the View > Pixel Aspect Ratio
menu.
Delete a pixel aspect ratio
1. With the document open, choose View > Pixel Aspect Ratio > Delete Pixel Aspect Ratio.
2. In the Delete Pixel Aspect Ratio dialog box, choose the item to delete from the Pixel Aspect Ratio menu, and click Delete.
Reset the pixel aspect ratios
1. With the document open, choose View > Pixel Aspect Ratio > Reset Pixel Aspect Ratios.
2. In the dialog box, choose one of the following:
Replaces the current pixel aspect ratios with the default values plus any custom pixel aspect ratios. This option is useful if you
deleted a default value and want to restore it to the menu but also want to retain any custom values.
Replaces the current pixel aspect ratios with the default values. Custom pixel aspect ratios are discarded.
Cancels the command.
Prepare images for use in After Effects
You can import a Photoshop (PSD) file directly into an After Effects project with the option of preserving individual layers, layer styles, transparent
areas and layer masks, and adjustment layers (preserving the individual elements for animation).
note: For best results, work in RGB mode, which After Effects uses. After Effects CS3 and later can convert files from CMYK to RGB. After Effects
7 and earlier cannot.
Before you export a layered Photoshop file for use in After Effects, do the following to reduce preview and rendering time and to avoid problems
with importing and updating Photoshop layers.
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