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Chapter 3. Managing Footage > Correcting for Pixel Aspect Ratios

Correcting for Pixel Aspect Ratios

In Chapter 2, you learned the importance of correctly interpreting an image's pixel aspect ratio (PAR) to prevent the image from appearing distorted (if you missed the discussion, turn to the sidebar “PAR Excellence,” in Chapter 2). But even properly interpreted, footage and comps that use a nonsquare PAR (such as DV or D1, with a PAR of .9) will result in an image that looks distorted on a typical computer display (PAR of 1) (Figure 3.100). Fortunately, After Effects can compensate for the distortion due to PAR (Figure 3.101). As After Effects warns you when you use the Toggle Pixel Aspect Ratio Correction button, correcting the image this way is for viewing purposes only; it doesn't affect the image's actual scale. And because correcting an image requires some processing, it will take slightly longer to render frames.


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